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Sealed Linear Encoders
March 2003
DIADUR, AURODUR, and PRECIMET® are registered trademarks of
DR. JOHANNES HEIDENHAIN GmbH, Traunreut, Germany.
Zerodur® is a registered trademark of Schott-Glaswerke, Mainz.
This catalog supersedes all previous
editions, which thereby become invalid.
The basis for ordering from
HEIDENHAIN is always the catalog
edition valid when the contract is made.
Standards (ISO, EN, etc.) apply only
where explicitly stated in the catalog.
For information on
• exposed linear encoders
• angle encoders
• rotary encoders
• HEIDENHAIN subsequent electronics
• HEIDENHAIN TNC controls
• machine calibration
please contact your HEIDENHAIN
representative.
Linear encoders with slimline scale housing
Linear encoders with full-size scale housing
Contents
Overview
Sealed Linear Encoders 4
Selection Guide 6
Technical Characteristics and Mounting Information
Measuring Principles Measuring standard 8
Absolute measuring methods 8
Incremental measuring methods 9
Photoelectric scanning 10
Measuring Accuracy 12
Mechanical Design Types and Mounting 14
General Mechanical Information 17
Specifications
Linear encoder
Recommended measuring
step for positioning Series or model
For very high repeatability up to 0.1 µm LF 481 18
LF 183 20
For absolute position measurement up to 0.1 µm LC 481 22
LC 181 24
For NC machines up to 0.5 µm LS 400 Series 26
LS 100 Series 28
For large measuring lengths up to 0.1 µm LB 382—Single-Section 30
LB 382—Multi-Section 32
For simple applications up to 5 µm LS 323 34
LS 623 36
For bending machines up to 5 µm LS 629 38
For simple applications up to 10 µm LIM 500 Series 40
Electrical Connections
Incremental Signals 1 VPP 42
TTL 44
Absolute Position Values EnDat 46
Connecting Elements and Cables 51
General Electrical Information 54
Evaluation Electronics 56
HEIDENHAIN Measuring and Testing Equipment 58
Sealed Linear Encoders
Simplified representation of the LS 186 Sealed Linear Encoder.
Sealing lips Mounting block Adapter cable
Scanning carriage
Light source
DIADUR
scale
Photovoltaic
cells Precision coupling
Sealed linear encoders are designed
primarily for use on machines and
installations that operate in harsh
environments, such as
• Milling machines
• Drilling and boring machines
• Machining centers
• Lathes
• Grinding machines
• Electrical discharge machines
• Welding machines
• Bending presses
Mechanical design
The scale, scanning unit and guideway of
sealed linear encoders are protected
against chips, swarf, dirt and splashwater
by an aluminum housing and flexible
sealing lips. The scanning carriage travels
on a low-friction guide within the scale unit.
It is connected with the external mounting
block by a coupling that compensates
unavoidable misalignment between the
scale and the machine guideways.
Maximum permissible vertical and lateral
misalignment between scale and mounting
block is ±0.2 mm to ±0.3 mm, depending
on the model of encoder.
Linear encoders measure the position of
linear axes without additional mechanical
transfer elements. This eliminates a
number of potential error sources:
• Positioning error due to thermal behavior
of the recirculating ballscrew
• Backlash
• Kinematic error through lead-screw pitch
error
Linear encoders are therefore
indispensable for machines that fulfill high
requirements for positioning accuracy
and machining speed.
5
Thermal behavior
The thermal behavior of the linear encoder
is an essential criterion for the working
accuracy of the machine. As a general rule,
the thermal behavior of the linear encoder
should match that of the workpiece or
measured object. During temperature
changes, the linear encoder should expand
or retract in a defined, reproducible manner.
The graduation carriers of HEIDENHAIN
linear encoders (see table) have differing
coefficients of thermal expansion. This
makes it possible to select the linear
encoder with thermal behavior best suited
to the application.
Sealed linear encoders
Product family LF, LS, LB, LC
Design • Scale and scanning unit protected by aluminum housing
• Scanning unit guided on scale via ball bearings
• Coupling between scanning unit and mounting block to compensate small
errors in
machine guideway
Protection IEC 60529 IP 53 when mounted according to instructions
IP 64 with introduction of compressed air to the scale or mounting block
Vibration 55 to 2000 Hz Max. 300 m/s2 (IEC 60068-2-6)
Max. acceleration in meas. direction 100 m/s2
Max. traversing speed 180 m/min
Accuracy grades To ± 2 µm
Graduation carrier Glass, steel
Coefficient of thermal expansion LF: 10 ppm/K
LC, LS: 8 ppm/K
LB: same as scale mounting surface
or 10 ppm/K
Overview
Cross section Measuring
step*
Accuracy
grades
For very high repeatability
• Steel scale
• Small signal period
To 0.1 µm ± 5 µm
± 3 µm
For absolute position measurement
• Glass scale
To 0.1 µm ± 5 µm
± 3 µm
For NC machines
• Glass scale
To 0.5 µm ± 5 µm
± 3 µm
For simple applications
• Glass scale
To 5 µm ± 10 µm
For very high repeatability
• Steel scale
• Small signal period
• High vibration rating
To 0.1 µm ± 3 µm
± 2 µm
For absolute position measurement
• Glass scale
• High vibration rating
To 0.1 µm ± 5 µm
± 3 µm
For NC machines
• Glass scale
• High vibration rating
To 0.5 µm ± 5 µm
± 3 µm
For large measuring lengths
• Steel scale
• High vibration rating
To 0.1 µm ± 5 µm
For simple applications
• Glass scale
To 5 µm ± 10 µm
For bending machines and press
brakes
• Mounted linear guide
• Glass scale
For simple applications
• For large measuring lengths
• Magnetic measuring principle
To 10 µm ± 100 µm
*For position measurement
6
Selection Guide
28 with mounting spar
Special Linear Encoder
The LIM 500 linear encoder consists of a
scanning head and separate sealed scale
unit. It operates without friction. The
scanning head and scale are adjusted to
each other during mounting.
Sealed Linear Encoders with
Slimline Scale Housing
The sealed linear encoders with slimline
scale housing are designed for limited
installation space. When installed with the
mounting spar they are also available in
greater measuring lengths and permit
higher acceleration loading.
28 with mounting spar
Sealed Linear Encoders with
Full-Size Scale Housing
The sealed linear encoders with full-size
scale housing are characterized by their
sturdy construction and large measuring
lengths. The scanning carriage is connected
with the mounting block over an oblique
blade that permits mounting both in
upright and reclining positions with the
same protection rating.
Measuring length Interface Model Page
50 mm to 1220 mm 1 VPP LF 481 18
70 mm to 1240 mm
with mounting spar:
70 mm to 2040 mm
EnDat and 1 VPP LC 481 22
TTL LS 476 26
1 VPP LS 486
70 mm to 1240 mm
with mounting spar:
70 mm to 2040 mm
TTL LS 477
1 VPP LS 487
70 mm to 1240 mm TTL LS 323 34
140 mm to 3040 mm 1 VPP LF 183 20
140 mm to 3040 mm EnDat and 1 VPP LC 181 24
140 mm to 3040 mm TTL LS 176 28
1 VPP LS 186
440 mm to 30040 mm 1 VPP LB 382 30
32
170 mm to 3040 mm TTL LS 623 36
170 mm to 920 mm TTL LS 629 38
440 mm to 28040 mm TTL LIM 571 40
1 VPP LIM 581
7
LB 382
LS 186
LF 183
LS 487
LC 481
8
Measuring Principles
Measuring Standard
HEIDENHAIN encoders with optical
scanning incorporate measuring standards
made of periodic structures known as
graduations. These graduations are applied
to a carrier substrate of glass or steel. The
scale substrate for large measuring lengths
is a steel tape.
The precision graduations are
manufactured in different photolithographic
processes. Graduations are fabricated from:
• extremely hard chrome lines on glass,
• matte-etched lines on gold-plated steel
tape, or
• three-dimensional structures on glass or
steel substrates.
The photolithographic manufacturing
processes developed by HEIDENHAIN
produce grating periods of typically 40 µm
to 4 µm.
These processes permit very fine grating
periods and are characterized by a high
definition and homogeneity of the line
edges. Together with the photoelectric
scanning method, this high edge definition
is a precondition for the high quality of the
output signals.
The master graduations are manufactured
by HEIDENHAIN on a custom-built
high-precision ruling machine.
Magnetic encoders use a magnetizable
layer as graduation carrier. In this layer a
graduation consisting of north and south
poles is formed.
With the absolute measuring method,
the position value is available from the
encoder immediately upon switch-on and
can be called at any time by the
subsequent electronics. There is no need
to move the axes to find the reference
position. The absolute position information
is read from the scale graduation, which
is designed as a serial code structure or
consists of several parallel graduation
tracks with slightly different grating periods.
A separate incremental track or the track
with the finest grating period is interpolated
for the position value and at the same time
is used to generate an optional incremental
signal.
Graduations of absolute linear encoders
Absolute code structure with complementary incremental track on
the scale of an LC 481
Absolute Measuring Methods
9
Incremental Measuring Methods
With incremental measuring methods,
the graduation consists of a regular grating
structure. The position information is
obtained by counting the individual
increments (measuring steps) from some
point of origin. Since an absolute reference
is required to ascertain positions, the scales
or scale tapes are provided with an
additional track that bears a reference
mark. The absolute position on the scale,
established by the reference mark, is gated
with exactly one measuring step. The
reference mark must therefore be scanned
to establish an absolute reference or to find
the last selected datum.
In some cases this may necessitate
machine movement over large lengths of
the measuring range. To speed and
simplify such "reference runs," many
encoders feature distance-coded
reference marks—multiple reference
marks that are individually spaced
according to a mathematical algorithm. The
subsequent electronics find the absolute
reference after traversing two successive
reference marks—only a few millimeters
traverse (see table).
Encoders with distance-coded reference
marks are identified with a "C" behind the
model designation (e.g., LS 486 C).
With distance-coded reference marks, the
absolute reference is calculated by
counting the signal periods between two
reference marks and using the following
formula:
P1= ( abs B–sgn B–1) x N+ ( sgn B–sgn D) x abs MRR
where:
B= 2 x MRR–N
and:
P1 = Position of the first traversed
reference mark in signal periods
abs = Absolute value
sgn = Sign function (= "+1" or "–1")
MRR= Number of signal periods between
the traversed reference marks
2 2
N = Nominal increment between two
fixed reference marks in signal
periods (see table below)
D = Direction of traverse (+1 or –1).
Traverse to the right (when installed
properly) equals +1.
Signal period Nominal
increment Nin
signal periods
Maximum
traverse
LF 4 µm 5000 20 mm
LS 20 µm 1000 20 mm
LB 40 µm 2000 80 mm
Incremental graduation with distance-coded reference marks on
the scale of an LS encoder
Dimensions
in mm
Graduations of incremental linear encoders
Technical Characteristics
10
Photoelectric Scanning
Most HEIDENHAIN encoders operate on
the principle of photoelectric scanning. The
photoelectric scanning of a measuring
standard is contact-free, and therefore
without wear. It detects even the finest
graduation lines just a few micrometers
wide, and generates output signals with
very small signal periods.
The finer the grating period of a measuring
standard is, the greater the effect of
diffraction on photoelectric scanning.
HEIDENHAIN uses two scanning principles
with angle encoders:
• The imaging scanning principle for
grating periods from 10 µm to 40 µm.
• The interferential scanning principle
for very fine graduations with grating
periods of 4 µm, for example.
Imaging scanning principle
To put it simply, the imaging scanning
principle functions by means of
projected-light signal generation: two scale
gratings with equal grating periods are
moved relative to each other—the scale and
the scanning reticle. The carrier material of
the scanning reticle is transparent, whereas
the graduation on the measuring standard
may be applied to a transparent or reflective
surface.
When parallel light passes through a grating,
light and dark surfaces are projected at a
certain distance. An index grating with the
same grating period is located here. When
the two gratings move relative to each
other, the incident light is modulated: if the
gaps are aligned, light passes through. If the
lines of one grating coincide with the gaps
of the other, no light passes through.
Photocells convert these variations in light
intensity into nearly sinusoidal electrical
signals. The specially structured grating of
the scanning reticle filters the light current
to generate nearly sinusoidal output signals.
The smaller the grating period of the grating
structure is, the closer and more tightly
toleranced the gap must be between the
scanning reticle and scale. Practical
mounting tolerances for encoders with the
imaging scanning principle are achieved
with grating periods of 10 µm and larger.
The LC, LS and LB linear encoders operate
according to the imaging scanning principle.
Imaging scanning principle
LED light source
Measuring standard
Photocells
Condenser lens
Scanning reticle
I90° and I270°
photocells are not
shown
11
Interferential scanning principle
The interferential scanning principle of the
LF exploits the diffraction and interference
of light on a fine graduation to produce
signals used to measure displacement. A
step grating is used as the measuring
standard: reflective lines 0.2 µm high are
applied to a flat, reflective surface. In
front of that is the scanning reticle—a
transparent phase grating with the same
grating period as the scale.
When a light wave passes through the
scanning reticle, it is diffracted into three
partial waves of the orders –1, 0, and 1,
with approximately equal luminous
intensity. The waves are diffracted by the
scale such that most of the luminous
intensity is found in the reflected diffraction
orders 1 and –1. These partial waves meet
again at the phase grating of the scanning
reticle where they are diffracted again and
interfere. This produces essentially three
waves that leave the scanning reticle at
different angles. Photocells convert these
light intensities into electrical signals.
Interferential scanning principle
C Grating period
Phase shift of the light wave when passing through the
scanning reticle
Phase shift of the light wave due to motion xof the scale
LED
light source
Photocells
Condenser lens
Scanning reticle
Measuring standard
A relative motion of the scanning reticle to
the scale causes the diffracted wave fronts
to undergo a phase shift: when the grating
moves by one period, the wave front of the
first order is displaced by one wavelength
in the positive direction, and the
wavelength of diffraction order –1 is
displaced by one wavelength in the
negative direction. Since the waves
interfere with each other when exiting the
grating, the waves are shifted relative to
each other by two wavelengths. This
results in two signal periods from the
relative motion of just one grating period.
Interferential encoders function with grating
periods of, for example, 8 µm, 4 µm and
finer. Their scanning signals are largely free
of harmonics and can be highly
interpolated. These encoders are therefore
especially suited for high resolution and
high accuracy. Even so, their generous
mounting tolerances permit installation in a
wide range of applications.
Sealed linear encoders that operate
according to the interferential scanning
principle are given the designation LF.
12
Measuring Accuracy
The accuracy of linear measurement is
mainly determined by:
• the quality of the graduation
• the quality of scanning
• the quality of the signal processing
electronics
• the error from the scale guideway over
the scanning unit.
A distinction is made between position
error over relatively large paths of
traverse—for example the entire measuring
range—and that within one signal period.
Position error over the measuring length
The accuracy of sealed linear encoders is
specified as accuracy grades, which are
defined as follows:
The extreme values of the total error F of a
position lie—with reference to their mean
value—over any max. one-meter section of
the measuring length within the accuracy
grade ±a.
This tolerance band is also shown in the
calibration chart (see opposite page) and
represents the position error within one
signal period. With sealed linear encoders,
this value applies to the complete encoder
system including the scanning unit. It is
then referred to as the system accuracy.
Position error within one signal period
The position error within one signal period
is determined by the quality of scanning
and the signal period of the encoder. At any
position over the entire measuring length, it
does not exceed approx. ±2% of the signal
period. The smaller the signal period, the
smaller the position error within one signal
period.
Position error
Position
Position error within
one signal period
Position error Fover the measuring length ML
Position error uwithin one signal period Signal levels Position error
Signal period
360° elec.
Signal period of
scanning signals
Max. position error uapprox.
within one signal period
LF 4 µm 0.08 µm
LC 181 16 µm 0.3 µm
LC 481 20 µm 0.4 µm
LS 20 µm 0.4 µm
LB 40 µm 0.8 µm
13
All HEIDENHAIN linear encoders are
inspected before shipping for accuracy and
proper function.
They are calibrated for accuracy during
traverse in both directions. The number of
measuring positions is selected to
determine very exactly not only the
long-range error, but also the position error
within one signal period.
The Manufacturer's Inspection
Certificate confirms the specified system
accuracy of each encoder. The calibration
standards also listed ensure the
traceability—as required by ISO 9001—to
recognized national or international
standards.
For the LC, LF, LS 100 and LS 400 series, a
calibration chart documents the position
error over the measuring range and also
states the measuring step and measuring
uncertainty of the calibration.
Temperature range
The length gauges are calibrated at a
reference temperature of 20 °C (68 °F).
The system accuracy given in the
calibration chart applies at this temperature.
The operating temperature indicates the
ambient temperature limits between which
the length gauges will function properly.
The storage temperature of –20 °C to
70 °C (–4 °F to 158 °F) applies for the
device in its packaging.
14
Mechanical Design Types and Mounting
Linear Encoders with Small Cross Section
The slimline linear encoders LC, LF and LS
are fastened to a machined surface either
directly or over a mounting spar.
The encoder is mounted so that the sealing
lips are directed downward or away from
splashing water (see also General Mechanical
Information).
Thermal behavior
Because they are rigidly fastened using two
M8 screws, the linear encoders largely
adapt themselves to the thermal behavior
of the mounting surface. When fastened
over the mounting spar, the encoder is
fixed to the midpoint of the mounting
surface. The flexible fastening elements
ensure reproducible thermal behavior.
The LF 481 with its graduation carrier of
steel has the same coefficient of expansion
as a mounting surface of gray cast iron or
steel.
Mounting
It is surprisingly simple to mount the linear
encoders from HEIDENHAIN: The shipping
brace already sets the proper gap between
the scale unit and the scanning unit. You
need only align the scale unit at several
points to the machine guideway. Stop
surfaces or stop pins can also be used to
align the scale.
The use of a mounting spar can be of
great benefit when mounting slimline linear
encoders. A mounting spar can be fastened
as part of the machine assembly process,
so that the encoder can be easily clamped
later as a final step. Easy exchange also
facilitates servicing.
Shipping brace
Mounting spar
15
Mounting spar
The full-size linear encoders LB, LC, LF and
LS 100 are fastened over their entire length
onto a machined surface. This gives them a
high vibration rating.
The slanted arrangement of the sealing lips
permits universal mounting both in
upright and reclining positions with the
same degree of protection.
Thermal behavior
The LB, LC, LF and LS 100 linear encoders
with large cross section are optimized in
their thermal behavior.
On the LF the steel scale is cemented to a
steel carrier that is fastened directly to the
machine element.
On the LB the steel scale tape is clamped
directly onto the machine element. The LF
and LB therefore take part in all thermal
changes of the mounting surface.
The LC and LS are fixed to the midpoint of
the mounting surface. The flexible
fastening elements permit a reproducible
thermal behavior.
Mounting
When sealed linear encoders from
HEIDENHAIN are mounted, the shipping
brace already sets the proper gap between
the scale unit and the scanning unit. You
need only align the scale unit at several
points to the machine guideway. Stop
surfaces or stop pins can also be used to
align the scale.
Mounting the LB 382 multi-section
The LB 382 with measuring lengths over
3240 mm (127 in.) is mounted on the
machine in individual sections:
• Mount and align the individual housing
sections
• Pull in the scale tape over the entire
length and tension it
• Pull in the sealing lips
• Insert the scanning unit
Adjustment of the tensioning of the scale
tape enables linear machine error
compensation up to ±100 µm/m.
LB, LC, LF, and LS 100 Linear Encoders—with Large Cross Section
16
Mechanical Design Types and Mounting
LS 600 Linear Encoders—with Large Cross Section
The full-size linear encoders LS 600 are
fastened to a machined surface only at
their ends with their mounting blocks.
Measuring lengths over 620 mm (24.4 in.)
require support brackets to improve
vibration behavior. Due to their lower
accuracy, reproducible thermal behavior is
not required from these encoders.
The inclined arrangement of the sealing lips
permits universal mounting with vertical
or horizontal scale housing with equally
high protection rating.
Due to the low accuracy requirements,
these encoders do not require reproducible
thermal behavior.
Mounting the LS 623
When the LS 623 is mounted, the shipping
brace already sets the proper gap between
the scale unit and the scanning unit. You
need only align the scale unit at several
points to the machine guideway.
Mounting the LS 629
The LS 629 features a high-quality steel
guide with ground guideways and a
backlash-free recirculating ball carriage,
which moves the scanning unit along the
scale. The scanning head is connected with
the moving machine element by a coupling
rod (available as an accessory), which
permits the large mounting tolerance of
±5 millimeters. This makes it possible to
use the encoder, for example, on press
brakes with heavy loads.
Accessory
Coupling rod
Including mounting block and screws for
connection with the LS 629, e.g. on press
brakes and plate bending machines.
Guideway
17
Mounting guidelines
To simplify cable routing, the mounting
block of the scanning unit is usually
screwed onto a stationary machine part.
The mounting location for the linear
encoders should be carefully considered in
order to ensure both optimum accuracy
and the longest possible service life.
• The encoder should be mounted as
closely as possible to the working plane
to keep the Abbe error low.
• To function properly, linear encoders
must not be continuously subjected to
strong vibration; the more solid parts of
the machine tool provide the best mounting
surface in this respect. Encoders
should not be mounted on hollow parts
or with adapters. A mounting spar is
recommended for the sealed linear
encoders with small cross section.
• To avoid temperature influences, install
the encoder away from sources of heat.
Acceleration
Linear encoders are subject to various
types of acceleration during operation and
mounting.
• The indicated maximum values for
vibration apply for frequencies of 55 to
2000 Hz (IEC 60068-2-6). Any
acceleration exceeding permissible
values, for example due to resonance
depending on the application and
mounting, might damage the encoder.
Comprehensive tests of the entire
system are required.
• The maximum permissible acceleration
values (semi-sinusoidal shock) for shock
and impact are valid for 11 ms
(IEC 60068-2-27). Under no
circumstances should a hammer or
similar implement be used to adjust or
position the encoder.
Required moving force
The required moving force is the maximum
force required to move the scale unit
relative to the scanning unit.
Expendable parts
In particular the following parts in encoders
from HEIDENHAIN are subject to wear:
• LED light source
• Bearings in encoders with integral
bearing
• Sealing lips for sealed linear encoders
Mechanical Data
DA 300
Compressed Air Unit
Degree of protection
Sealed linear encoders are protected to
the degree IP 53 according to IEC 60529
and EN 60529, provided that they are
mounted with the sealing lips facing away
from splashing liquids. If necessary, provide
a separate protective cover. If the encoder
will be exposed to heavy concentrations of
coolant and lubricant mist, the scale
housing can be supplied with compressed
air to provide IP 64 protection and
effectively prevent the ingress of
contamination. All HEIDENHAIN LB, LC, LF
and LS sealed linear encoders feature
compressed air inlets at the scale end
blocks and on the mounting block of the
scanning unit.
The compressed air that is introduced
directly into the encoder housing must
have been cleaned in a microfilter and must
comply with the following quality classes
as per ISO 8573-1:
• Solid contaminants: Class 1
(max. particle size 0.1 µm and max.
particle density 0.1 mg/m3 at 1 · 105 Pa)
• Total oil content: Class 1
(max. oil concentration 0.01 mg/m3 at
1 · 105 Pa)
• Max. pressure dew point: Class 4
(+3 °C at 2 · 105 Pa)
The required rate of compressed air flow is
7 to 10 liters/minute per linear encoder; the
permissible pressure lies in the range of 0.6
to 1 bar. The compressed air may be
introduced into the encoder only through a
connector with integral throttle (included
with the LB, LC, LF, LS 1x6, and LS 4x6
encoders).
HEIDENHAIN offers the DA 300
Compressed Air Unit for cleaning and
preparing compressed air. It consists of
two filter stages (microfilter and activated
carbon filter), automatic condensation
separator, and a pressure regulator with
manometer. It also includes 25 meters of
pressure tubing as well as T-joints and
connecting pieces for four encoders. The
DA 300 can serve for up to 10 encoders
with a maximum total measuring length of
35 meters.
At an operating pressure of 7 bars, the
compressed air introduced into the encoder
exceeds by far the required purity. The
manometer and pressure switch (available
as accessories) enable effective monitoring
of the function of the DA 300.
18
Dimensions
in mm
LF 481
Incremental linear encoders for measuring steps of 1 µmto 0.1 µm
(0.00005 in. to 0.000005 in.)
• Thermal behavior similar to steel or cast iron
• For limited installation space
Mounting spar
ML m
50 ... 500
(2 ... 19.7")
0
550 ... 900
(21.6 ... 35.4")
1
1000 ... 1220
(39.4 ... 48")
2
Specifications LF 481
Measuring standard
Grating period
Thermal expansion coefficient
DIADUR phase grating on steel
8 µm
therm 10 ppm/K
Accuracy grade* ± 5 µm (± 0.0002 in.)
± 3 µm (± 0.00012 in.)
Measuring length ML* in mm 50, 100, 150, 200, 250, 300,
Mounting spar* recommended 350, 400, 450, 500, 550, 600,
650, 700, 750, 800, 900, 1000,
1120, 1220
Reference marks* LF 481
LF 481C
ML 50 mm: 1 ref. mark at midpoint;
ML 100 to 1000 MM: 2, each 25mm
from start/end of ML
From 1120 mm: 2, each 35mm
from start/end of ML
Distance-coded; absolute position value
available after max. 20mmtraverse
Max. traversing speed 30 m/min (1181 ipm)
Vibration 55 to 2000 Hz
Shock 11 ms
80 m/s2 (IEC 60068-2-6)
100 m/s2 (IEC 60068-2-27)
Required moving force 5 N
Protection IEC 60529 IP 53 when installed as per instructions
IP 64 with compressed air
Operating temperature 0 to 50 °C (32 to 122 °F)
Weight without mounting spar 0.4 kg + 0.5 kg/m measuring length
Power supply 5 V ± 5%/< 200 mA
Incremental signals
Signal period
Cutoff frequency –3 dB
1 VPP
4 µm
200 kHz
Electrical connection
Max. cable length
Sep. adapter cable (1 m/3 m/6 m/9 m)
for mounting block
150 m (492 ft)
* Please indicate when ordering
=Without mounting spar
=With mounting spar
F =Machine guideway
P =Gauging points for alignment
=Required mating dimensions
=Compressed air inlet
=Reference mark position LF 481
=Reference mark position LF 481C
=Beginning of measuring length (ML)
=Direction of scanning unit motion for
output signals in accordance with
interface description
Two reference marks for measuring lengths
50 ... 1000
(2" ... 39.4")
1120 ... 1220
(44" ... 48")
zi = 25 (.98")
zi = ML – 50 (1.97")
zi = 35 (1.38")
zi = ML – 70 (2.76")
inches 2, 3.94, 5.9, 7.9, 9.8, 11.8,
13.8, 15.7, 17.7, 19.7, 21.6, 23.6,
25.6, 27.6, 29.5, 31.5, 35.4, 39.4,
44, 48
19
LF 481 without mounting spar
LF 481 with mounting spar
Specifications
20
Dimensions
in mm
LF 183
Incremental linear encoders for measuring steps of 1 µmto 0.1 µm
(0.00005 in. to 0.000005 in.)
• Thermal behavior similar to steel or cast iron
• High vibration rating
• Horizontal mounting possible
, ,
=Mounting options
F =Machine guideway
P =Gauging points for alignment
=Required mating dimensions
=Compressed air inlet
=Reference mark position LF 183
=Reference mark position LF 183C
=Beginning of measuring length (ML)
=Direction of scanning unit motion for
output signals in accordance with
interface description
Specifications LF 183
Measuring standard
Grating period
Thermal expansion coefficient
DIADUR phase grating on steel
8 µm
therm 10 ppm/K
Accuracy grade* ± 3 µm (± 0.00012 in.)
± 2 µm (± 0.00008 in.)
Measuring length ML* in mm 140, 240, 340, 440, 540, 640,
740, 840, 940, 1040, 1140, 1240,
1340, 1440, 1540, 1640, 1740, 1840,
2040, 2240, 2440, 2640, 2840, 3040
Reference marks* LF 183
LF 183C
Selectable every 50 mm by magnet
Standard: 1 ref. mark at midpoint
Distance-coded; absolute position value
available after max. 20 mm traverse
Max. traversing speed 60 m/min (2360 ipm)
Vibration 55 to 2000 Hz
Shock 11 ms
150 m/s2 (IEC 60068-2-6)
300 m/s2 (IEC 60068-2-27)
Required moving force 4 N
Protection IEC 60529 IP 53 when installed as per instructions
IP 64 with compressed air
Operating temperature 0 to 40 °C (32 to 104 °F)
Weight 1.1 kg + 3.8 kg/m measuring length
Power supply 5 V ± 5%/< 200 mA
Incremental signals
Signal period
Cutoff frequency –3 dB
1 VPP
4 µm
200 kHz
Electrical connection
Max. cable length
Sep. adapter cable (1 m/3 m/6 m/9 m)
for mounting block
150 m (492 ft)
* Please indicate when ordering
inches 5.5, 9.5, 13.4, 17.3, 21.3, 25,
29, 33, 37, 41, 44, 48,
52, 56, 60, 64, 68, 72,
80, 88, 96, 104, 112, 120
21
Dimensions
in mm
LC 481
Absolute linear encoder for measuring steps of 1 µmto 0.1 µm
(0.00005 in. to 0.000005 in.)
• High positioning accuracy and traversing speed through single-field
scanning
• With defined thermal behavior
• For limited installation space
• Absolute position values and incremental signals via EnDat interface
Specifications LC 481
Measuring standard
Thermal expansion coefficient
DIADUR glass scale with absolute track
and incremental track
therm 8 ppm/K
Accuracy grade* ± 5 µm (± 0.0002 in.)
± 3 µm (± 0.00012 in.)
Measuring length ML* in mm 70, 120, 170, 220, 270, 320, 370,
Mounting spar* recommended 420, 470, 520, 570, 620, 720, 770,
820, 920, 1020, 1140, 1240,
Only with mounting spar 1340, 1440, 1540, 1640, 1740, 1840,
2040
Max. traversing speed mech. 180 m/min (7090 ipm)
Vibration without mounting spar
55 to 2000 Hz with mounting spar
Shock 11 ms
100 m/s2 (IEC 60068-2-6)
200 m/s2 (IEC 60068-2-6)
300 m/s2 (IEC 60068-2-27)
Required moving force 5 N
Protection IEC 60529 IP 53 when installed as per instructions
IP 64 with compressed air
Operating temperature 0 to 50 °C (32 to 122 °F)
Weight without mounting spar 0.2 kg + 0.5 kg/m measuring length
Power supply 5 V ± 5 % at encoder/
max. 300 mA (with no load)
(power supply via remote sensing
possible)
Absolute position value EnDat interface
Incremental signals
Signal period
Cutoff frequency –3 dB
1 VPP
20 µm
150 kHz
Electrical connection
Max. cable length
Sep. adapter cable (1 m/3 m/6 m/9 m)
for mounting block
150 m (492 ft).
* Please indicate when ordering
=Without mounting spar
=With mounting spar
F =Machine guideway
P =Gauging points for alignment
=Required mating dimensions
=Compressed air inlet
=Beginning of measuring length (ML)
at 20 mm
=Direction of scanning unit motion for
output signals in accordance with
interface description
2.7, 4.7, 6.7, 8.6, 10.6, 12.6, 14.5
16.5, 18.5, 20.5, 22.4, 24.4, 28, 30,
32, 36, 40, 44, 48,
52, 56, 60, 64, 68, 72,
80
Mounting spar
ML m
70 ... 520
(2.7 ... 20.5")
0
570 ... 920
(22.4 ... 36")
1
1020 ... 1340
(40 ... 52")
2
1440 ... 1740
(56 ... 68")
3
1840 ... 2040
(72 ... 80")
4
inches
23
LC 481 without mounting spar
LC 481 with mounting spar
24
Dimensions
in mm
LC 181
Absolute linear encoder for measuring steps of 1 µmto 0.1 µm
(0.00005 in. to 0.000005 in.)
• With defined thermal behavior
• Absolute position values and incremental signals via EnDat interface
• High vibration rating
• Horizontal mounting possible
, ,
=Mounting options
F =Machine guideway
P =Gauging points for alignment
=Required mating dimensions
=Compressed air inlet
=Beginning of measuring length (ML)
(at position 20 mm)
=Does not apply if (ML/2 + 30)/100 = integer
=Direction of scanning unit motion for
output signals in accordance with
interface description
Specifications LC 181
Measuring standard
Thermal expansion coefficient
DIADUR glass scale with 7 tracks of
different grating periods
therm 8 ppm/K
Accuracy grade* ± 5 µm (± 0.0002 in.)
± 3 µm (± 0.00012 in.)
Measuring length ML* in mm 140, 240, 340, 440, 540, 640,
740, 840, 940, 1040, 1140, 1240,
1340, 1440, 1540, 1640, 1740, 1840,
2040, 2240, 2440, 2640, 2840, 3040
Max. traversing speed (mech.) 120 m/min (4720 ipm)
Vibration 55 to 2000 Hz
Shock 11 ms
200 m/s2 (IEC 60068-2-6)
300 m/s2 (IEC 60068-2-27)
Required moving force 4 N
Protection IEC 60529 IP 53 when installed as per instructions
IP 64 with compressed air
Operating temperature 0 to 50 °C (32 to 122 °F)
Weight 0.4 kg + 2.6 kg/m measuring length
Power supply 5 V ± 5 % at encoder/
max. 300 mA (with no load)
Absolute position value
Accuracy/max.
traversing speed
for absolute position value
EnDat-Interface
± 16 LSB accuracy: 3 m/min
± 40 LSB accuracy: 120 m/min
Incremental signals
Signal period
Cutoff frequency –3 dB
1 VPP
16 µm
130 kHz
Electrical connection
Max. cable length
Sep. adapter cable (1 m/3 m/6 m/9 m)
for mounting block
150 m (492 ft) with remote sensing
* Please indicate when ordering
inches 5.5, 9.5, 13.4, 17.3, 21.3, 25,
29, 33, 37, 41, 44, 48,
52, 56, 60, 64, 68, 72,
80, 88, 96, 104, 112, 120
26
Dimensions
in mm
LS 476, LS 477
LS 486, LS 487
Incremental linear encoders for measuring steps of 1 µmand 0.5 µm
(0.00005 in. to 0.00002 in.)
• Defined thermal behavior
• For limited installation space
• Simple installation with mounting spar
• LS 477/LS 487 with compact mounting block
Specifications LS 476, LS 477
LS 486, LS 487
Measuring standard
Grating period
Thermal expansion coefficient
Glass scale with DIADUR graduation
20 µm
therm 8 ppm/K
Accuracy grade* ± 5 µmor ± 3 µm
Measuring length ML* in mm 70, 120, 170, 220, 270, 320, 370,
Mounting spar* recommended 420, 470, 520, 570, 620, 720, 770,
820, 920, 1020, 1140, 1240,
Mounting spar required 1340, 1440, 1540, 1640, 1740, 1840,
2040
Reference marks* LS 4xx
LS 4xxC
Selectable every 50 mm by magnet;
Standard: ML 70 mm 1 at midpoint;
up to 1020 mm: 2, each 35 mm from
start/end of ML; from 1140 mm: 2,
each 45 mm from start/end of ML
Distance-coded; absolute position value
available after max. 20 mm
Max. traversing speed 120 m/min (4720 ipm)
(LS 476/LS 477: see page 44)
Vibration without mounting spar
55 to 2000 Hz with mounting spar
Shock 11 ms
100 m/s2 (IEC 60068-2-6)
200 m/s2 (IEC 60068-2-6)
300 m/s2 (IEC 60068-2-27)
Required moving force 5 N
Protection IEC 60529 IP 53 when installed as per instructions
IP 64 with compressed air
Operating temperature 0 to 50 °C (32 to 122 °F)
Weight without mounting spar 0.4 kg + 0.5 kg/m measuring length
Power supply LS 47x
LS 48x
5 V ± 5%/< 140 mA (with no load)
5 V ± 5%/< 120 mA
Incremental signals LS 47x
Signal period with integral interpolation*
TTL
4 µm/2 µm with 5-fold/10-fold
Incremental signals LS 48x
Signal period
Cutoff frequency –3 dB
1 VPP
20 µm
160 kHz
Electrical connection
Max. cable length LS 47x
LS 48x
Sep. adapter cable (1/3/6/9 m) for mtng. block
50 m (164 ft)
150 m (492 ft)
Mounting spar
ML m
70 ... 520
(2.7 ... 20.5")
0
570 ... 920
(22.4 ... 36")
1
1020 ... 1340
(40 ... 52")
2
1440 ... 1740
(56 ... 68")
3
1840 ... 2040
(72 ... 80")
4
inches 2.7, 4.7, 6.7, 8.6, 10.6, 12.6, 14.5
16.5, 18.5, 20.5, 22.4, 24.4, 28, 30,
32, 36, 40, 44, 48,
52, 56, 60, 64, 68, 72,
80
=Without mounting spar
=With mounting spar
F =Machine guideway
P =Gauging points for alignment
=Required mating dimensions
=Compressed air inlet
=Reference mark position LS 4x6
=Reference mark position LS 4x6C
=Beginning of measuring length (ML)
=Direction of scanning unit motion for
output signals in accordance with
interface description
* Please indicate when ordering
Two reference marks for measuring lengths
70 ... 1020
(2.7 ... 40")
1140 ... 2040
(44 ... 80")
z = 35 mm
zi = ML – 70 mm (2.76")
z = 45mm
zi = ML – 90 mm (3.54")
LS 476/486 LS 477/LS 487
LS 476/LS 486
LS 477/LS 487
LS 487 without mounting spar
LS 486C with mounting spar
28
Dimensions
in mm
LS 176
LS 186
Incremental linear encoders for measuring steps of 1 µmand 0.5 µm
(0.00005 in. and 0.00002 in.)
• Defined thermal behavior
• High vibration rating
• Horizontal mounting possible
, ,
=Mounting options
F =Machine guideway
P =Gauging points for alignment
=Required mating dimensions
=Compressed air inlet
=Reference mark position LS 1x6
=Reference mark position LS 1x6C
=Beginning of measuring length (ML)
=Direction of scanning unit motion for
output signals in accordance with
interface description
Specifications LS 176
LS 186
Measuring standard
Grating period
Thermal expansion coefficient
Glass scale with DIADUR graduation
20 µm
therm 8 ppm/K
Accuracy grade* ± 5 µm (± 0.0002 in.)
± 3 µm (± 0.00012 in.)
Measuring length ML* in mm 140, 240, 340, 440, 540, 640,
740, 840, 940, 1040, 1140, 1240,
1340, 1440, 1540, 1640, 1740, 1840,
2040, 2240, 2440, 2640, 2840, 3040
Reference marks* LS 1x6
LS 1x6C
Every 50 mm via selector magnets
Standard setting: one reference mark at
midpoint
Distance-coded; absolute position value
available after max. 20 mm traverse
Max. traversing speed 120 m/min (4720 ipm)
(LS 176: see page 44)
Vibration 55 to 2000 Hz
Shock 11 ms
200 m/s2 (IEC 60068-2-6)
400 m/s2 (IEC 60068-2-27)
Required moving force 4 N
Protection IEC 60529 IP 53 when installed as per instructions
IP 64 with compressed air
Operating temperature 0 to 50 °C (32 to 122 °F)
Weight 0.4 kg + 2.3 kg/m measuring length
Power supply LS 176
LS 186
5 V ± 5%/< 140 mA (with no load)
5 V ± 5%/< 120 mA
Incremental signals LS 176
Signal period with integral interpolation*
TTL
4 µm/2 µm with 5-fold/10-fold
Incremental signals LS 186
Signal period
Cutoff frequency –3 dB
1 VPP
20 µm
160 kHz
Electrical connection
Max. cable length LS 176
LS 186
Sep. adapter cable (1 m/3 m/6 m/9 m)
for mounting block
50 m (164 ft)
150 m (492 ft)
* Please indicate when ordering
inches 5.5, 9.5, 13.4, 17.3, 21.3 25,
29, 33, 37, 41, 44, 48,
30
Dimensions
in mm
, ,
=Mounting options
F =Machine guideway
=Required mating dimensions
=Compressed air inlet
=Reference mark position LB 382
=Reference mark position LB 382C
=Beginning of measuring length (ML)
=Direction of scanning unit motion for
output signals in accordance with
interface description
Specifications LB 382 up to ML 3040mm
Measuring standard
Grating period
Thermal expansion coefficient
Stainless steel tape with
AURODUR graduation
40 µm
therm 10 ppm/K
Accuracy grade ± 5 µm (± 0.0002 in.)
Measuring length ML* in mm Single-section housing
440, 640, 840, 1040, 1240, 1440,
1640, 1840, 2040, 2240, 2440, 2640,
2840, 3040
Reference marks* LB 382
LB 382C
Every 50 mm via selector plates
Standard setting: one reference mark at
midpoint
Distance-coded;
absolute position value available after
max. 80 mm traverse
Max. traversing speed 120 m/min (180 m/min on request)
Vibration 55 to 2000 Hz
Shock 11 ms
300 m/s2 (IEC 60068-2-6)
300 m/s2 (IEC 60068-2-27)
Required moving force 15 N
Protection IEC 60529 IP 53 when installed as per instructions
IP 64 with compressed air
Operating temperature 0 to 50 °C (32 to 122 °F)
Weight 1.3 kg + 3.6 kg/m measuring length
Power supply 5 V ± 5%/< 150 mA
Incremental signals
Signal period
Cutoff frequency –3 dB
1 VPP
40 µm
250 kHz
Electrical connection
Max. cable length
Sep. adapter cable (1 m/3 m/6 m/9 m)
for mounting block
150 m (492 ft)
LB 382 up to 3040mm(120 in.) Measuring Length
(Single-Section Housing)
Incremental linear encoders for measuring steps to 1 µm(0.00005 in.)
• With linear machine error compensation
• With defined thermal behavior
• Horizontal mounting possible
• Mirror-inverted version available
inches
17.3, 25, 33, 41, 48, 56,
64, 72, 80, 88, 96, 104,
112, 120
32
Dimensions
in mm
LB 382 up to 30040mm(100 ft) Measuring Length
(Multi-Section Housing)
Incremental linear encoders for large traverses up to 30m
• Measuring steps to 0.1 µm (0.000005 in.)
• With linear machine error compensation
• Horizontal mounting possible
• Mirror-inverted version available
, ,
=Mounting options
F =Machine guideway
=Required mating dimensions
=Compressed air inlet
=Reference mark position LB 382
=Reference mark position LB 382C
=Beginning of measuring length (ML)
=Housing section lengths
=Direction of scanning unit motion for
output signals in accordance with
interface description
Specifications LB 382 from ML 3240mm
Measuring standard
Grating period
Thermal expansion coefficient
Stainless steel tape with
AURODUR graduation
40 µm
Same as machine main casting
Accuracy grade ± 5 µm (± 0.0002 in.)
Measuring length ML* in mm Kit with single AURODUR steel tape and
housing sections for ML from 3240 mm
to 30040 mm in 200 mm steps.
Housing section lengths:
1000, 1200, 1400, 1600, 1800, 2000
Reference marks* LB 382
LB 382C
Every 50 mm via selector plates
Distance-coded;
absolute position value available after
max. 80 mm traverse
Max. traversing speed 120 m/min (4720 ipm)
Vibration 55 to 2000 Hz
Shock 11 ms
300 m/s2 (IEC 60068-2-6)
300 m/s2 (IEC 60068-2-27)
Required moving force 15 N
Protection IEC 60529 IP 53 when installed as per instructions
IP 64 with compressed air
Operating temperature 0 to 50 °C (32 to 122 °F)
Weight 1.3 kg + 3.6 kg/m measuring length
Power supply 5 V ± 5%/< 150 mA
Incremental signals
Signal period
Cutoff frequency –3 dB
1 VPP
40 µm
250 kHz
Electrical connection
Max. cable length
Sep. adapter cable (1 m/3 m/6 m/9 m)
for mounting block
150 m (492 ft)
* Please indicate when ordering
inches
39, 47, 55, 63, 70.9, 78.7
33
34
Dimensions
in mm
LS 323
Incremental linear encoder
• For measuring steps of 10 µm and 5 µm (0.0005 in. and 0.0002 in.)
• For limited installation space
Specifications LS 323
Measuring standard
Grating period
Glass scale with DIADUR graduation
20 µm
Accuracy grade ± 10 µm (± 0.0004 in.)
Measuring length ML* in mm 70, 120, 170, 220, 270, 320,
370, 420, 470, 520, 570,
Mounting spar* recommended 620, 720, 770, 820, 920, 1020,
1140, 1240
Reference marks* LS 323
LS 323C
Every 50mmvia selector magnets
Standard setting:
ML 70 mm: 1 reference mark at midpoint;
up to 1020 mm: 2, each 35 mm from
start/end of ML;
from 1140 mm: 2, each 45 mm from
start/end of ML
Distance-coded, absolute position value
available after max. 20 mm
Max. traversing speed 120 m/min (4720 ipm)
Vibration without mounting spar
55 to 2000 Hz with mounting spar
Shock 11 ms
100 m/s2 (IEC 60068-2-6)
200 m/s2 (IEC 60068-2-6)
300 m/s2 (IEC 60068-2-27)
Required moving force 5 N
Protection IEC 60529 IP 53 when installed as per instructions
IP 64 with compressed air
Operating temperature 0 to 50 °C (32 to 122 °F)
Weight 0.4 kg + 0.5 kg/m measuring length
Power supply 5 V ± 5 %/< 170mA (with no load)
Incremental signals
Signal period
Edge separation a
TTL (reference pulse non-gated)
20 µm
1,25 µs
Electrical connection
Max. cable length
Cable 3 m (9.9 ft) without connector
50 m (164 ft)
* Please indicate when ordering
=Without mounting spar
=With mounting spar
F =Machine guideway
P =Gauging points for alignment
=Required mating dimensions
=Compressed air inlet
=Reference mark position LS 323
=Reference mark position LS 323C
=Beginning of measuring length (ML)
=Direction of scanning unit motion for
output signals in accordance with
interface description
Two reference marks for measuring lengths
70 ... 1020
(2.7 ... 40")
1140 ... 2040
(44 ... 80")
z = 35 mm (1.38")
zi = ML – 70 mm (2.76")
z = 45 mm (1.77")
zi = ML – 90 mm (3.54")
Mounting spar
ML m
70 ... 520
(2.7 ... 20.5")
0
570 ... 920
(22.4 ... 36")
1
1020 ... 1240
(40 ... 48")
2
inches 2.7, 4.7, 6.7, 8.6, 10.6, 12.6,
14.5, 16.5, 18.5 20.5, 22.4,
24.4, 28, 30, 32, 36, 40,
44, 48
35
36
Dimensions
in mm
LS 623
Incremental linear encoder for measuring steps of 10 µm and 5 µm(0.0005
in. and 0.0002 in.)
Specifications LS 623
Measuring standard
Grating period
Glass scale with DIADUR graduation
20 µm
Accuracy grade ± 10 µm (± 0.0004 in.)
Measuring length ML* in mm 170, 220, 270, 320, 370, 420,
470, 520, 620, 720, 770, 820,
920, 1020, 1140, 1240, 1340, 1440,
1540, 1640, 1740, 1840, 2040, 2240,
2440, 2640, 2840, 3040
Reference marks* LS 623
LS 623C
Every 50 mm via selector magnets
Standard setting: one reference mark at
midpoint
Distance-coded, absolute position value
available after max. 20 mm traverse
Max. traversing speed 60 m/min (2362 ipm)
Vibration 55 to 2000 Hz
Shock 11 ms
30 m/s2 (IEC 60068-2-6)
200 m/s2 (IEC 60068-2-27)
Required moving force 40 N
Protection IEC 60529 IP 53 when installed as per instructions
IP 64 with compressed air
Operating temperature 0 to 50 °C (32 to 122 °F)
Weight 0.7 kg + 2 kg/m measuring length
Power supply 5 V ± 5 %/< 170mA (with no load)
Incremental signals
Signal period
Edge separation a
TTL
20 µm
2,5 µs
Electrical connection
Max. cable length
Sep. adapter cable (1 m/3 m/6 m)
with or without armor
50 m (164 ft) max.
* Please indicate when ordering
, ,
= Mounting options
F = Machine guideway
P, Q = Gauging points for alignment
= Required mating dimensions
= Compressed air inlet
= Reference mark position LS 623
= Reference mark position LS 623C
= Beginning of measuring length (ML)
= Direction of scanning unit motion for
output signals in accordance with
interface description
inches 6.7, 8.6, 10.6, 12.6, 14.5, 16.5,
18.5, 20.5, 24.4, 28, 30, 32,
36, 40, 44, 48, 52, 56,
60, 64, 68, 72, 80, 88,
96, 104, 112, 120
37
38
Dimensions
in mm
LS 629
Incremental linear encoder for measuring steps of 10 µm and 5 µm(0.0005
in. and 0.0002 in.)
• With integrated guide
• Large mounting tolerances and connection over coupling rod
Specifications LS 629
Measuring standard
Grating period
Glass scale with DIADUR grating
20 µm
Accuracy grade ± 10 µm (± 0.0004 in.)
Measuring length ML* in mm 170, 220, 270, 320, 370, 420,
470, 520, 620, 720, 770, 820,
920
Reference marks* LS 629
LS 629C
Selectable every 50 mm by magnet
Standard setting: 1 reference mark at
midpoint
Distance-coded for ascertaining the
absolute position value after max. 20 mm
traverse
Max. traversing speed 50 m/min (2362 ipm)
Vibration 55 to 2000 Hz
Shock 11 ms
30 m/s2 (IEC 60068-2-6)
200 m/s2 (IEC 60068-2-27)
Required moving force 10 N
Protection IEC 60529 IP 53 when installed as per instructions
IP 64 with compressed air
Operating temperature 0 to 50 °C (32 to 122 °F)
Weight 0.9 kg + 2.5 kg/m measuring length
Power supply 5 V ± 5 %/< 170mA (without load)
Incremental signals
Signal period
Edge separation a
TTL
20 µm
2,5 µs
Electrical connection
Max. cable length
Sep. adapter cable (1 m/3 m/6 m)
with and without armor
50 m (164 ft) max.
* Please indicate when ordering
, ,
, = Mounting options
F = Machine guideway
P, Q = Gauging points for alignment
= Required mating dimensions
= Compressed air inlet
= Reference mark position LS 629
= Reference mark position LS 629C
= Beginning of measuring length (ML)
= Direction of scanning unit motion for
output signals in accordance with
interface description
inches 6.7, 8.6, 10.6, 12.6, 14.5, 16.5,
18.5, 20.5, 24.4, 28, 30, 32,
36
39
Mounting with coupling rod
40
Dimensions
in mm
LIM 571
LIM 581
Incremental linear encoder for a measuring step of 10 µm (0.0005 in.)
• For limited installation space
• For large measuring lengths
• Magnetic scanning principle
Specifications LIM 571
LIM 581
Measuring standard
Grating period
Magnetic plastic layer on steel support
tape
10.24 mm
Accuracy grade ± 100 µm (± 0.004 in.)
Measuring length ML* in mm/inches 440 mm to 2040 mm (17.3 in. to 80 in.)
in
steps of 200 mm (7.9 in.) as single piece.
2240 mm to 28 040 mm
(88 in. to 1103.9 in.) in steps of 200 mm
(7.9 in.) as kit with one scale in several
housing sections.
Reference marks Possible every 10.24mm
Max. traversing speed 600 m/min (23600 ipm)
Vibration 55 to 2000 Hz
Shock 11 ms
200 m/s2 (IEC 60068-2-6)
500 m/s2 (IEC 60068-2-27)
Protection IEC 60529 IP 64
Operating temperature 0° to 50° C (32° to 122 °F)
Weight Scanning head: Approx. 250 g
Scale: Approx. 25 g + 375 g/m
measuring length
Power supply LIM 571
LIM 581
5 V ± 5 %/< 240mA (without load)
5 V ± 5 %/< 150mA (without load)
Incremental signals LIM 571
Signal period with integral interpolation
Edge separation a
TTL
40 µm with 256-fold
0,5 µs
Incremental signals LIM 581
Signal period
1 VPP
10.24 mm
Electrical connection*
Max. cable length LIM 571
LIM 581
• Cable 3 m (9.9 ft) with connector
• Armored cable
3 m (9.9 ft) with connector
100 m (329 ft)
150 m (492 ft)
* Please indicate when ordering
= Single-section housing
= Multi-section housing
, ,
, = Mounting options
F = Machine guideway
= Required mating dimensions
= Composed of housing sections
(available lengths 1000, 1200, 1400,
1600, 1800, 2000)
= Reference mark position
= Beginning of measuring length (ML)
= Direction of scanning unit motion for
output signals in accordance with
interface description
41
D Cable
4.5 without armor
10 with armor
42
Interfaces
Incremental Signals 1 VPP
HEIDENHAIN encoders with 1 VPP
interface provide voltage signals that can
be highly interpolated.
The sinusoidal incremental signals A and
B are phase-shifted by 90° elec. and have
an amplitude of typically 1 VPP.
The illustrated sequence of output
signals—with B lagging A—applies for the
direction of motion shown in the dimension
drawing.
The reference mark signal R has a usable
component Gof approx. 0.5 V. Next to the
reference mark, the output signal can be
reduced by up to 1.7 V to an idle level H.
This must not cause the subsequent
electronics to overdrive. In the lowered
signal level, signal peaks can also appear
with the amplitude G.
The data on signal amplitude apply when
the power supply given in the specifications
is connected to the encoder. They refer to
a differential measurement at the 120 ohm
terminating resistor between the associated
outputs. The signal amplitude decreases
with increasing frequency. The cutoff
frequency indicates the scanning frequency
at which a certain percentage of the original
signal amplitude is maintained:
• –3 dB cutoff frequency:
70%of the signal amplitude
• –6 dB cutoff frequency:
50%of the signal amplitude
Interpolation/resolution/measuring step
The output signals of the 1 VPP interface
are usually interpolated in the subsequent
electronics in order to attain sufficiently
high resolutions. For velocity control,
interpolation factors are commonly over
1000 in order to receive usable velocity
information even at low speeds.
Measuring steps for position measurement
are recommended in the specifications. For
special applications, other resolutions are
also possible.
Signal period
360° elec.
(nominal value)
A, B, R measured with oscilloscope in differential mode
Signal
amplitude [%]
–3 dB cutoff frequency
–6 dB cutoff frequency
Scanning
frequency [kHz]
Cutoff frequency
Typical signal
amplitude curve
with respect to
the scanning
frequency
Interface Sinusoidal voltage signals 1 VPP
Incremental signals Two nearly sinusoidal signals A and B
Signal amplitude M: 0.6 to 1.2 VPP; 1 VPP typical
Asymmetry IP – NI/2M: 0.065
Amplitude ratio MA/MB: 0.8 to 1.25
Phase angle I 1 + 2I/2: 90° ± 10° elec.
Reference mark
signal
One or more signal peaks R
Usable component G: 0.2 to 0.85 V
Quiescent value H: 0.04 V to 1.7 V
Switching threshold E, F: 40 mV
Zero crossovers K, L: 180° ± 90° elec.
Connecting cable
Cable length
Propagation time
HEIDENHAIN cable with shielding
PUR [4(2 · 0.14 mm2) + (4 · 0.5mm2)]
Max. 150 m distributed capacitance 90 pF/m
6 ns/m
Any limited tolerances in the encoders are listed in the specifications.
43
Electrical Connections
Input Circuitry of the
Subsequent Electronics
Dimensioning
Operational amplifier MC 34074
Z0 = 120
R1 = 10 k and C1 = 100 pF
R2 = 34.8 k and C2 = 10 pF
UB = ±15 V
U1 Approx. U0
–3dB cutoff frequency of circuitry
Approx. 450 kHz
Approx. 50 kHz with C1 = 1000 pF
and C2= 82pF
This circuit variant does reduce the
bandwidth of the circuit, but in doing
so it improves its noise immunity.
Circuit output signals
Ua = 3.48 VPP typical
Gain 3.48
Signal monitoring
A threshold sensitivity of 250 mVPP is to be
provided for monitoring the 1 VPP incremental
signals.
Incremental
signals
Reference mark
signal
Ra < 100 ,
typically 24
Ca < 50 pF
Ia<1mA
U0 = 2.5 V ± 0.5 V
(with respect to 0 V of
the supply voltage)
1 VPP
Subsequent electronics Encoder
12-pin HEIDENHAIN coupling 12-pin PCB connector 15-pin D-sub connector
for IK 115
Power supply Incremental signals Other signals
12 2 10 11 5 6 8 1 3 4 9 7 /
4 12 2 10 1 9 3 11 14 7 5/8/13/15 13 /
2a 2b 1a 1b 6b 6a 5b 5a 4b 4a / 3a /
UP Sensor
UP
0 V Sensor
0 V
A+ A– B+ B– R+ R– Vacant Vacant Vacant
Brown/
Green
Blue White/
Green
White Brown Green Gray Pink Red Black / Violet Yellow
Shield is on housing; UP = power supply
Sensor: The sensor line is connected internally to the respective power
supply.
Pin Layout
44
Interfaces
Incremental Signals TTL
HEIDENHAIN encoders with TTL
interface incorporate electronics that digitize
sinusoidal scanning signals with or without
interpolation.
The incremental signals are transmitted as
the square-wave pulse trains Ua1 and Ua2,
phase-shifted by 90° elec. The reference
mark signal consists of one or more
reference pulses Ua0, which are gated with
the incremental signals. In addition, the
integrated electronics produce their inverse
signals , and for noise-proof
transmission. The illustrated sequence of
output signals—with Ua2 lagging Ua1—
applies for the direction of motion shown in
the dimension drawing.
The fault-detection signal indicates
fault conditions such as breakage of the
power line or failure of the light source. It
can be used for such purposes as machine
shut-off during automated production.
The distance between two successive
edges of the incremental signals Ua1 and
Ua2 through 1-fold, 2-fold or 4-fold evaluation
is one measuring step.
The subsequent electronics must be
designed to detect each edge of the
square-wave pulse. The minimum edge
separation alisted in the Specifications
applies for the illustrated input circuitry with
a cable length of 1 m, and refers to a
measurement at the output of the differential
line receiver. Propagation-time differences
in cables additionally reduce the edge
separation by 0.2 ns per meter of cable
length. To prevent counting error, design
the subsequent electronics to process as
little as 90% of the resulting edge
separation. The max. permissible shaft
speed or traversing velocity must never
be exceeded.
Interface Square-wave signals TTL
Incremental signals 2 TTL square-wave signals Ua1, Ua2 and their
inverted signals
,
Reference mark
signal
Pulse width
Delay time
One or more TTL square-wave pulses Ua0 and their inverse
pulses
90° elec. (other widths available on request); LS 323:nongated
|td| 50 ns
Fault detection
signal
Pulse width
One TTL square-wave pulse
Improper function: LOW (on request: Ua1/Ua2 high impedance)
Proper function: HIGH
tS 20 ms
Signal level Differential line driver as per EIA standard RS 422
UH 2.5 V at –IH = 20mA
UL 0.5 V at IL = 20mA
Permissible load Z0 100 between associated outputs
|ILI 20 mA max. load per output
Cload 1000 pF with respect to 0 V
Outputs protected against short circuit to 0 V
Switching times
(10% to 90%)
t+ / t– 30 ns (typically 10 ns)
with 1 m cable and recommended input circuitry
Connecting cable
Cable length
Propagation time
HEIDENHAIN cable with shielding
PUR [4(2 × 0.14 mm2) + (4 × 0.5mm2)]
Max. 100m( max. 50 m) with distributed capacitance 90 pF/m
6 ns/m
Signal period 360° elec. Fault
Measuring step
after 4-fold evaluation
Inverse signals , , are not shown
Meas. step1)/
Interpolation*
Traversing speed Edge separation Scanning
frequency*
1 µm/5-fold 120 m/min2)
120 m/min
60 m/min
0.25 µs
0.5 µs
1 µs
200 kHz
100 kHz
50 kHz
0.5 µm/10-fold 120 m/min
60 m/min
30 m/min
100 kHz
50 kHz
25 kHz
* Please indicate when ordering
1) After 4-fold evaluation
2) Mechanically limited
LS 176, LS 476, LS 477
Relationship between traversing speed,
edge separation and scanning frequency.
45
12-pin
HEIDENHAIN
flange socket
or
coupling
12-pin
HEIDENHAIN
connector
Power supply Incremental signals Other signals
12 2 10 11 5 6 8 1 3 4 7 / 9
UP Sensor
UP
0 V Sensor
0 V
Ua1 Ua2 Ua0 1) Vacant Vacant2)
Brown/
Green
Blue White/
Green
White Brown Green Gray Pink Red Black Violet / Yellow
Shield is on housing; UP = Power supply
Sensor: The sensor line is connected internally to the respective power
supply
1) LS 323: Vacant
2) Exposed linear encoders: Switchover TTL/11 µAPP for PWT
Pin Layout
Incremental signals
Reference mark
signal
Fault detection
signal
Subsequent electronics Encoder Input Circuitry of the
Subsequent Electronics
Dimensioning
IC1 = Recommended
differential line receivers
DS 26 C 32 AT
Only for a > 0.1 µs:
AM 26 LS 32
MC 3486
SN 75 ALS 193
R1 = 4.7 k
R2 = 1.8 k
0 = 120
C1 = 220 pF (serves to improve
noise immunity)
The permissible cable length for
transmission of the TTL square-wave signals
to the subsequent electronics depends on
the edge separation a.It is max. 100 m, or
50 m for the fault detection signal. This
requires, however, that the power supply
(see Specifications) be ensured at the
encoder. The sensor lines can be used to
measure the voltage at the encoder and, if
required, correct it with an automatic
system (remote sense power supply).
Cable length [m]
Edge separation [µs]
without
with
Permissible
cable length
with respect to the
edge separation
46
Input circuitry of the subsequent electronics
As a bidirectional interface, the EnDat
(Encoder Data) interface for absolute
encoders is capable of producing absolute
position values as well as requesting or
updating information stored in the encoder.
Thanks to the serial transmission method
only four signal lines are required. The
type of transmission (position values or
parameters) is selected by mode commands
that the subsequent electronics send to the
encoder. The data are transmitted in
synchronism with the clock signal from
the subsequent electronics.
Benefits of the EnDat interface
• One interface for all absolute encoders,
whereby the subsequent electronics can
automatically distinguish between EnDat
and SSI.
• Complementary output of incremental
signals (optional for highly dynamic
control loops).
• Automatic self-configuration during
encoder installation, since all information
required by the subsequent electronics is
already stored in the encoder.
• Reduced wiring cost
For standard applications, six lines are
sufficient.
• High system security through alarms
and messages that can be evaluated in
the subsequent electronics for monitoring
and diagnosis. No additional lines are
required.
• Minimized transmission times through
adaptation of the data word length to the
resolution of the encoder and through
high clock frequencies.
• High transmission reliability through
cyclic redundancy checks.
• Datum shifting through an offset value
in the encoder.
• It is possible to form a redundant
system, since the absolute value and
incremental signals are output
independently from each other.
Interfaces
Absolute Position Values
Cable lengths [m]
Clock frequency [kHz]
Interface EnDat 2.1 serial bidirectional
Data transfer Absolute position values and parameters
Data input Differential line receiver according to EIA standard RS 485
for
CLOCK, CLOCK, DATA and DATA signals
Data output Differential line driver according to EIA standard RS 485
for the
DATA and DATA signals
Signal level Differential voltage output > 1.7 V with Z0 = 120 load*)
(EIA standard RS 485)
Code Pure binary code
Ascending
position values
In traverse direction indicated by arrow (see Dimensions)
Incremental signals 1 VPP (see 1 VPP Incremental Signals)
Connecting cable
Cable length
Propagation time
HEIDENHAIN cable with shielding
PUR [(4 x 0.14 mm2) + 4(2 x 0.14 mm2) + (4 x 0.5mm2)]
Max. 150 m with 90 pF/m distributed capacitance
6 ns/m
*) Terminating and receiver input resistor
Data transfer
IC1 = RS 485
differential line receiver
and driver
C3 = 330 pF
Z0 = 120
Incremental signals
Permissible
clock frequency
with respect to
cable lengths
Encoder Subsequentelectronics
47
Function of the EnDat Interface
The EnDat interface outputs absolute
position values, optionally makes incremental
signals available, and permits
reading from and writing to the memory
in the encoder.
Selecting the transmission type
Position values and memory contents are
transmitted serially through the DATA lines.
The type of information to be transmitted
is selected by mode commands. Mode
commands define the content of the
information that follows. Every mode
command consists of 3 bits. To ensure
transmission reliability, each bit is also
transmitted inverted. If the encoder detects
an erroneous mode transmission, it
transmits an error message.
The following mode commands are
available:
• Encoder transmit absolute position value
• Selection of the memory area
• Encoder transmit/receive parameters of
the last defined memory area
• Encoder transmit test values
• Encoder receive test commands
• Encoder receive RESET
Parameters
The encoder provides several memory
areas for parameters. These can be read
from by the subsequent electronics, and
some can be written to by the encoder
manufacturer, the OEM, or even the end
user. Certain memory areas can be
write-protected.
The parameters, which in most cases
are set by the OEM, largely define
the function of the encoder and the
EnDat interface. When the encoder is
exchanged, it is therefore essential that its
parameter settings are correct. Attempts to
configure machines without including OEM
data can result in malfunctions. If there is
any doubt as to the correct parameter
settings, the OEM should be consulted.
Memory Areas
Parameters of the encoder manufacturer
This write-protected memory area contains
all information specific to the encoder,
such as encoder type (linear/angular,
singleturn/multiturn, etc.), signal periods,
number of position values per revolution,
transmission format of absolute position
values, direction of rotation, maximum
permissible speed, accuracy dependent on
shaft speeds, support from warnings and
alarms, part number, and serial number.
This information forms the basis for
automatic configuration.
Parameters of the OEM
In this freely definable memory area, the
OEM can store his information. For
example, the “electronic ID label” of the
motor in which the encoder is integrated,
indicating the motor model, maximum
current rating, etc.
Operating parameters
This area is available to the customer for a
datum shift. It can be protected against
overwriting.
Operating status
This memory area provides detailed alarms
or warnings for diagnostic purposes. Here it
is also possible to activate write protection
for the OEM-parameter and operating
parameter memory areas, and interrogate
its status. Once activated, the write
protection cannot be reversed.
Monitoring and Diagnostic Functions
Alarms and warnings
The EnDat interface enables comprehensive
monitoring of the encoder without requiring
an additional transmission line.
An alarm becomes active if there is a
malfunction in the encoder that is presumably
causing incorrect position values. At the
same time, an alarm bit is set in the data
word. Alarm conditions include:
• Light unit failure
• Signal amplitude too low
• Error in calculation of position value
• Power supply too high/low
• Current consumption is excessive
Warnings indicate that certain tolerance
limits of the encoder have been reached or
exceeded—such as shaft speed or the limit
of light source intensity compensation
through voltage regulation—without implying
that the measured position values are
incorrect. This function makes it possible
to issue preventive warnings in order to
minimize idle time. The alarms and warnings
supported by the respective encoder are
saved in the “parameters of the encoder
manufacturer” memory area.
Reliable data transfer
To increase the reliability of data transfer,
a cyclic redundancy check (CRC) is
performed through the logical processing
of the individual bit values of a data word.
This 5-bit long CRC concludes every
transmission. The CRC is decoded in the
receiver electronics and compared with the
data word. This largely eliminates errors
caused by disturbances during data transfer.
Block diagram: Absolute encoder with EnDat interface
Incremental
signals
Absolute
position value
Operating
status
Operating
parameters
(e.g., datum
shift)
Parameters of
the encoder
manufacturer
Parameters
of the OEM
1 VPP A
1 VPP B
UP Power
0 V supply
EnDat interface
Absolute encoder Subsequent
electronics
48
Encoder saves
position value
Position value Cyclic redundancy
check
Subsequent electronics
transmit mode command
Mode command
Interrupted clock
The interrupted clock is intended particularly
for time-clocked systems such as closed
control loops. At the end of the data word
the clock signal is set to HIGH level. After
10 to 30 µs ( tm), the data line falls back to
LOW. Then a new data transmission can
begin by starting the clock.
Continuous clock
For applications that require fast acquisition
of the measured value, the EnDat interface
can have the clock run continuously.
Immediately after the last CRC bit has been
sent, the DATA line is switched to HIGH for
one clock cycle, and then to LOW. The
new position value is saved with the very
next falling edge of the clock and is output
in synchronism with the clock signal
immediately after the start bit and alarm bit.
Because the mode command encoder
transmits position valueis needed only
before the first data transmission, the
continuous-clock transfer mode reduces
the length of the clock-pulse group by
10 periods per position value.
Data transfer
The two types of EnDat data transfer are
position value transfer and parameter
transfer.
Control Cycles for Transfer of Position
Values
The clock signal is transmitted by the
subsequent electronics to synchronize the
data output from the encoder. When not
transmitting, the clock signal defaults to
HIGH. The transmission cycle begins with
the first falling edge. The measured values
are saved and the position value calculated.
After two clock pulses (2T), the subsequent
electronics send the mode command
Encoder transmit position value.
After successful calculation of the absolute
position value (tcal – see table), the start bit
begins the data transmission from the
encoder to the subsequent electronics.
The subsequent alarm bit is a common
signal for all monitored functions and
serves for failure monitoring. It becomes
active if a malfunction of the encoder might
result in incorrect position values. The exact
cause of the trouble is saved in the encoder’s
“operating status” memory where it can
be interrogated in detail.
The absolute position value is then
transmitted, beginning with the LSB. Its
length depends on the encoder being used.
It is saved in the encoder manufacturer’s
memory area. Since EnDat does not need
to fill superfluous bits with zeros as in SSI,
the transmission time of the position value
to the subsequent electronics is minimized.
Data transmission is concluded with the
cyclic redundancy check (CRC).
ROC, ECN,
ROQ, EQN1)
ECI/EQI1) RCN1) LC
Clock frequency fC 100 kHz to 2 MHz
Calculation time for
Position value
Parameter
tcal
tac
250 ns
Max. 12 ms
5 µs
Max. 12 ms
10 µs
Max. 12 ms
1ms
Max. 12 ms
Recovery time tm 10 to 30 µs
HIGH pulse width tHI 0.2 to 10 µs
LOW pulse width tLO 0.2 µs to 50 ms 0.2 to 30 µs
1)See also Rotary Encoders, Position Encoders for Servo Drives, Angle
Encoderscatalogs
Save new
position value
Position value
Save new
position value
CRC CRC
n = 0 to 5; system inherent
49
Encoder Subsequent electronics
Latch signal
1 VPP
Counter
Subdivision
Parallel
interface
Comparator
Control cycles for transfer of parameters
(mode command 001110)
Before parameter transfer, the memory
area is specified with the mode command
Select memory areaand a subsequent
memory-range-select code (MRS). The
possible memory areas are stored in the
parameters of the encoder manufacturer.
Due to internal access times to the
individual memory areas, the time tac may
reach 12 ms.
Reading parameters from the encoder
(mode command 100011)
After selecting the memory area, the
subsequent electronics transmit a complete
communications protocol beginning with
the mode command Encoder transmit
parameters,followed by an 8-bit address
and 16 bits with random content. The
encoder answers with the repetition of the
address and 16 bits with the contents of
the parameter. The transmission cycle is
concluded with a CRC check.
Writing parameters to the encoder
(mode command 011100)
After selecting the memory area, the
subsequent electronics transmit a complete
communications protocol beginning with
the mode command Encoder receive
parameters,followed by an 8-bit address
and a 16-bit parameter value. The encoder
answers by repeating the address and the
contents of the parameter. The CRC check
concludes the cycle.
Transmitter in encoder inactive
Receiver in encoder active
Transmitter in encoder active
MRS-code
Address
Address
x = random y = parameter Acknowledgment
MRS-code
Address
Address
Parameter
8 Bit 16 Bit 8 Bit 16 Bit
Synchronization of the serially
transmitted code value with the
incremental signal
Absolute encoders with EnDat interface
can exactly synchronize serially transmitted
absolute position values with incremental
values. With the first falling edge (latch signal)
of the CLOCK signal from the subsequent
electronics, the scanning signals of the
individual tracks in the encoder and counter
are frozen, as are also the A/D converters
for subdividing the sinusoidal incremental
signals in the subsequent electronics.
The code value transmitted over the serial
interface unambiguously identifies one
incremental signal period. The position value
is absolute within one sinusoidal period of
the incremental signal. The subdivided
incremental signal can therefore be appended
in the subsequent electronics to the serially
transmitted code value.
After power on and initial transmission of
position values, two redundant position
values are available in the subsequent electronics.
Since encoders with EnDat interface
guarantee a precise synchronization—
regardless of cable length—of the serially
transmitted absolute value with the
incremental signals, the two values can be
compared in the subsequent electronics.
This monitoring is possible even at high
shaft speeds thanks to the EnDat interface’s
short transmission times of less than 50 µs.
This capability is a prerequisite for modern
machine design and safety concepts.
1 VPP
50
Pin Layout
15-pin
D-sub connector, male
for IK 115
15-pin
D-sub connector, female
for HEIDENHAIN controls
and IK 220
Power supply Incremental signals Absolute position values
4 12 2 10 6 1 9 3 11 5 13 8 15
1 9 2 11 13 3 4 6 7 5 8 14 15
UP Sensor
UP
0 V Sensor
0 V
Internal
shield
A+ A– B+ B– DATA DATA CLOCK CLOCK
Brown/
Green
Blue White/
Green
White / Green/
Black
Yellow/
Black
Blue/
Black
Red/
Black
Gray Pink Violet Yellow
Shield is on housing; UP = power supply
Sensor: The sensor line is connected internally to the respective power
supply.
Vacant pins or wires must not be used!
17-pin
HEIDENHAIN
coupling or
flange socket
Power supply Incremental signals Absolute position values
7 1 10 4 11 15 16 12 13 14 17 8 9
UP Sensor
UP
0 V Sensor
0 V
Inside
shield
A+ A– B+ B– DATA DATA CLOCK CLOCK
Brown/
Green
Blue White/
Green
White / Green/
Black
Yellow/
Black
Blue/
Black
Red/
Black
Gray Pink Violet Yellow
Shield is on housing; UP = power supply
Sensor: The sensor line is connected internally to the respective power
supply.
Vacant pins or wires must not be used!
51
Connecting Elements and Cables
General Information
Connector: Connecting element with
coupling ring; insulated; available with male
or female contacts.
Flange socket: Permanently mounted on
the encoder, connection fixture or machine
housing, with external thread (like the
coupling), and available with male or female
contacts.
D-sub connector: For HEIDENHAIN controls,
counters and IK absolute value cards.
Coupling: Connecting element with
external thread; insulated; available with
male or female contacts; also as mounting
coupling.
HEIDENHAIN connector HEIDENHAIN coupling
HEIDENHAIN flange socket D-sub connector
43
x
The pins on connectors are numbered in
the direction opposite to those on couplings
or flange socket, regardless of whether the
contacts are
male contacts or
female contacts.
When engaged, the connections provide
protection to IP 67 (D-sub connector:
IP 50; IEC 60529). When not engaged,
there is no protection.
HEIDENHAIN mounted coupling with flange
y
Interface electronics
in connector
x 41.7 88.7
y 15.2 16.6
52
TTL and 1 VPP EnDat TTL and 1 VPP EnDat
LB 382,
LF 183,
LS 176,
LS 186
LS 623,
LS 629
LC 181 LF 481,
LS 476,
LS 486
LS 477,
LS 487
LC 481
Adapter cable with coupling (male)
Cable 6mm 310128-xx – 369124-xx 310123-xx 360645-xx 369129-xx
Adapter cable without connector
Cable 6mm 310131-xx 310740-xx1)
269503-xx2)
– 310134-xx 354319-xx –
Adapter cable with connector (male)
Cable 6mm 310127-xx 310735-xx1)
310736-xx2)
– 310122-xx 344228-xx –
Cable 4.5mm– – – – 352611-xx –
Adapter cable in armor
with coupling (male)
Cable 10mm – – 369128-xx – – 369133-xx
Adapter cable in armor
with connector (male)
Cable 10mm 310126-xx 310738-xx1) – 310121-xx 344451-xx –
Adapter cable with D-sub connector
(15-pin) for HEIDENHAIN controls and
for IK 220
Cable 6mm 298429-xx – 370737-xx3) 298430-xx 360974-xx 370747-xx3)
Available cable lengths: 1 m/3 m/6 m/9 m
1) Cable lengths 1 m/3 m/6 m
2) Cable length 9 m
3) Cable lengths 1 m/3 m/6 m/9 m/12 m/15 m
Adapter Cables
53
Coupling on encoder cable Coupling (male) Connector on encoder cable
Connector (male)
For encoder cable 6 mm 12-pin 291698-03
17-pin 296698-26
For encoder cable 4.5 mm
6 mm
12-pin 291697-06
12-pin 291697-07
PUR connecting cable 8mm
for encoders with coupling or flange socket
PUR connecting cable 8mm
for encoders with connector
Complete with connector (female)
and connector (male)
12-pin 298399-xx Complete with coupling (female)
and connector (male)
12-pin 298400-xx
Complete with connector (female)
and coupling (male)
17-pin 323897-xx With one coupling (female) 12-pin 298402-xx
Complete with connector (female)
and D-sub connector (female) for
IK 220 and HEIDENHAIN controls
12-pin 310199-xx
17-pin 332115-xx
With one connector (female) 12-pin 309777-xx
17-pin 309778-xx
Mating element on connecting cable
to coupling on encoder cable or
flange socket
Connector (female) Mating element on connecting cable
to connector on encoder cable
Coupling (female)
For connecting cable 8 mm 12-pin 291697-05
17-pin 291697-26
For connecting cable 8 mm 12-pin 291698-02
Connector on cable for connection to
subsequent electronics
Connector (male) Connector on cable for connection to
subsequent electronics
Connector (male)
For connecting cable 8 mm 12-pin 291697-08
17-pin 291697-27
For connecting cable 8 mm 12-pin 291697-08
Cable without connectors 12-pin 244957-01 [4(2 x 0.14 mm2) + (4 x
0.5mm2)]
17-pin 266306-01 [(4 x 0.14 mm2) + 4(2 x 0.14 mm2) + (4 x 0.5mm2)]
Flange socket for connecting cable to subsequent electronics
Flange socket (female),12-pin 315892-08
17-pin 315892-10
Coupling on mounting base (female), for cable 8 mm, 12-pin: 291698-07
Connecting Cables 1 VPP 12-pin
TTL 12-pin
EnDat 17-pin
54
Cables
Lengths
The cable lengths listed in the Specifications
apply only for HEIDENHAIN cables and the
recommended input circuitry of subsequent
electronics.
Durability
All encoders use polyurethane (PUR)
cables. PUR cables are resistant to oil,
hydrolysis and microbes in accordance
with VDE 0472. They are free of PVC
and silicone and comply with UL safety
directives. The UL certification
AWM STYLE 20963 80 °C 30 V E63216
is documented on the cable.
Temperature range
HEIDENHAIN cables can be used:
for rigid configuration –40 to 85 °C
for frequent flexing –10 to 85 °C
Cables with limited resistance to hydrolysis
and microbes are rated for up to 100 °C.
Bending radius
The permissible bending radii Rdepend on
the cable diameter and the configuration:
Rigid configuration
Frequent flexing
Electrically Permissible Speed/
Traversing Speed
The maximum permissible shaft speed or
traversing velocity of an encoder is derived
from
• the mechanically permissible shaft speed/
traversing velocity (if listed in Specifications)
and
• the electrically permissible shaft
speed/traversing velocity.
For encoders with sinusoidal output
signals, the electrically permissible shaft
speed/traversing velocity is limited by
the –3dB/ –6dB cutoff frequency or the
permissible input frequency of the
subsequent electronics.
For encoders with square-wave signals,
the electrically permissible shaft speed/
traversing velocity is limited by
– the maximum permissible scanning/
output frequency fmaxof the encoder
and
– the minimum permissible edge
separation afor the subsequent
electronics.
For angular/rotary encoders
nmax=
fmax · 103 · 60
For linear encoders
vmax= fmax· SP· 10–3 · 60
where
nmax: Electrically permissible shaft
speed in rpm,
vmax: Electrically permissible traversing
velocity in m/min
fmax: Maximum scanning/output frequency
of the encoder or input
frequency of the subsequent
electronics in kHz,
z: Line count of the angular/
rotary encoder per 360 °
SP: Signal period of the linear
encoder in µm
Typically 500 ms
UPP
Initial transient response of the
supply voltage e.g. 5 V ± 5 %
Power Supply
The encoders require a stabilized dc
voltage UPas power supply. The respective
specifications state the required power
supply and the current consumption. The
permissible ripple content of the dc voltage
is:
• High frequency interference
UPP < 250 mV with dU/dt > 5 V/µs
• Low-frequency fundamental ripple
UPP < 100 mV
The values apply as measured at the
encoder, i.e., without cable influences. The
voltage can be monitored and adjusted
with the device’s sensor lines. If a
controllable power supply is not available,
the voltage drop can be halved by
switching the sensor lines parallel to the
corresponding power lines.
Calculation of the voltage drop:
U= 2 · 10–3 ·
where
U: Line drop in V
LC: Cable length in mm
I: Current consumption of the
encoder in mA
(see Specifications)
AP: Cross section of power lines
in mm2
LC· I
56 · AP
HEIDENHAIN
cables
Cross section of supply lines AP
1 VPP/TTL/HTL 11 µAPP EnDat/SSI
3.7 mm 0.05 mm2 – –
4.5/5.1 mm 0.14/0.052) mm2 0.05 mm2 0.05 mm2
6/101)mm 0.19/ 0.143) mm2 – 0.08 mm2
8/141)mm 0.5 mm2 1mm2 0.5 mm2
HEIDENHAIN
cables
Rigid configuration
Frequent
flexing
3.7mm R 8mm R 40 mm
4.5mm
5.1mm
R 10 mm R 50 mm
6mm R 20 mm R 75 mm
8mm R 40 mm R 100 mm
10mm1) R 35 mm R 75 mm
8mm1) R 50 mm R 100 mm
1) Metal armor
2) Only on length gauges
3) Only for LIDA 400
z
General Electrical Information
55
Reliable Signal Transmission
Electromagnetic compatibility/
CE compliance
When properly installed, HEIDENHAIN
encoders fulfill the requirements for
electromagnetic compatibility according to
89/336/EWG with respect to the generic
standards for:
• Noise immunity IEC 61000-6-2:
Specifically:
– ESD IEC 61000-4-2
– Electromagnetic fields IEC 61000-4-3
– Burst IEC 61000-4-4
– Surge IEC 61000-4-5
– Conducted
disturbances IEC 61000-4-6
– Power frequency
magnetic fields IEC 61000-4-8
– Pulse magnetic fields IEC 61000-4-9
• Interference IEC 61000-6-4:
Specifically:
– For industrial, scientific and medical
(ISM) equipment IEC 55011
– For information technology
equipment IEC 55022
Transmission of measuring signalselectrical
noise immunity
Noise voltages arise mainly through
capacitive or inductive transfer. Electrical
noise can be introduced into the system
over signal lines and input or output
terminals. Possible sources of noise are:
• Strong magnetic fields from transformers
and electric motors
• Relays, contactors and solenoid valves
• High-frequency equipment, pulse
devices, and stray magnetic fields from
switch-mode power supplies
• AC power lines and supply lines to the
above devices
Isolation
The encoder housings are isolated against
all circuits.
Rated surge voltage: 500 V
(preferred value as per VDE 0110 Part 1)
Protection against electrical noise
The following measures must be taken to
ensure disturbance-free operation:
• Use only original HEIDENHAIN cables.
Watch for voltage attenuation on the
supply lines.
• Use connectors or terminal boxes with
metal housings. Do not conduct any
extraneous signals.
• Connect the housings of the encoder,
connector, terminal box and evaluation
electronics through the shield of the
cable. Connect the shielding in the area
of the cable inlets to be as induction-free
as possible (short, full-surface contact).
• Connect the entire shielding system with
the protective ground.
• Prevent contact of loose connector
housings with other metal surfaces.
• The cable shielding has the function of
an equipotential bonding conductor. If
compensating currents are to be expected
within the entire system, a separate
equipotential bonding conductor must be
provided.
See also EN 50178/ 4.98 Chapter 5.2.9.5
regarding “protective connection lines
with small cross section.”
• Connect HEIDENHAIN position encoders
only to subsequent electronics whose
power supply is generated through double
or strengthened insulation against line
voltage circuits. See also IEC 364-4-41:
1992, modified Chapter 411 regarding
“protection against both direct and
indirect touch” (PELV or SELV).
• Do not lay signal cables in the direct
vicinity of interference sources (inductive
consumers such as contacts, motors,
frequency inverters, solenoids, etc.).
• Sufficient decoupling from interferencesignal-
conducting cables can usually be
achieved by an air clearance of 100 mm
(4 in.) or, when cables are in metal ducts,
by a grounded partition.
• A minimum spacing of 200 mm (8 in.) to
inductors in switch-mode power supplies
is required. See also EN 50178 /4.98
Chapter 5.3.1.1 regarding cables and lines,
EN 50174-2 /09.01, Chapter 6.7 regarding
grounding and potential compensation.
• When using multiturn encoders in
electromagnetic fields greater than
10 mT, HEIDENHAIN recommends
consulting with the main facility in
Traunreut.
Both the cable shielding and the metal
housings of encoders and subsequent
electronics have a shielding function. The
housings must have the same potential
and be connected to the main signal ground
over the machine chassis or by means of a
separate potential compensating line.
Potential compensating lines should have a
minimum cross section of 6 mm2 (Cu).
Minimum distance from sources of interference
56
Evaluation Electronics
IBV 600 Series
Interpolation and Digitizing Electronics
The IBV 600 series features one input for
incremental linear or angle encoders with
sinusoidal output signals and a signal level
of 1 VPP. It provides TTL-compatible
square-wave output signals over a flange
socket.
The IBV 606 provides output signals at two
flange sockets simultaneously. The
connections inside the IBV 606 can be
changed so that either flange socket or
both flange sockets deliver sinusoidal
voltage signals with a signal level of 1 VPP
instead of square-wave output signals.
The required 5 V ±5% power supply must
be provided by the subsequent electronics.
Model Interpolation
Input
frequency
fi
Minimum
edge
separation
a
Smallest possible measuring
step
LF LS LB
IBV 600 Without 600 kHz 0.2 µs 1 µm 5 µm 10 µm
IBV 606 2-fold 500 kHz 0.15 µs 0.5 µm 5 µm 5 µm
IBV 610 5-fold 200 kHz
100 kHz
50 kHz
25 kHz
0.25 µs
0.5 µs
1 µs
2 µs
0.2 µm 1 µm 2 µm
10-fold 200 kHz
100 kHz
50 kHz
25 kHz
0.125 µs
0.25 µs
0.5 µs
1 µs
0.1 µm 0.5 µm 1 µm
IBV 650 50-fold 40 kHz
20 kHz
10 kHz
5 kHz
0.125 µs
0.25 µs
0.5 µs
1 µs
0.02 µm 0.1 µm 0.2 µm
IBV 660B 25-fold 100 kHz
50 kHz
25 kHz
12.5 kHz
0.1 µs
0.2 µs
0.4 µs
0.8 µs
0.04 µm 0.2 µm 0.4 µm
50-fold 50 kHz
25 kHz
12.5 kHz
6.25 kHz
0.1 µs
0.2 µs
0.4 µs
0.8 µs
0.02 µm 0.1 µm 0.2 µm
100-fold 25 kHz
12.5 kHz
6.25 kHz
3.12 kHz
0.1 µs
0.2 µs
0.4 µs
0.8 µs
0.01 µm 0.05 µm 0.1 µm
200-fold 12.5 kHz
6.25 kHz
3.12 kHz
1.56 kHz
0.1 µs
0.2 µs
0.4 µs
0.8 µs
0.005 µm 0.025 µm 0.05 µm
400-fold 6.25 kHz
3.12 kHz
1.56 kHz
0.78 kHz
0.1 µs
0.2 µs
0.4 µs
0.8 µs
0.0025 µm 0.0125 µm 0.025 µm
Recommended only for speed control
Adjustable Adjustable
For more information on the listed
interpolation and digitizing electronics as
well as on electronics for several machine
axes, ask for the separate brochure
Interpolation and Digitizing Electronics.
57
IK 220
Universal PC Counter Card
The IK 220 is an adapter card for AT
compatible PCs for measured value
acquisition of two incremental or
absolute linear and angular encoders.
The subdivision and counting electronics
subdivide the sinusoidal input signals up
to 4096-fold. Driver software is included.
IK 220
Input signals
(switchable)
1 VPP 11 µAPP EnDat
SSI
Encoder inputs Two D-sub ports (15-pin), male
Input frequency (max.) 500 kHz 33 kHz –
Cable length (max.) 60 m (197 ft) 10 m (32.8 ft)
Signal subdivision Up to 4096-fold
(signal period : measuring step)
Data register for measured
values (per channel)
48 bits (44 bits used)
Internal memory For 8192 position values
Interface PCI bus (plug and play)
Driver software and
demonstration program
For Windows 95/98/NT/2000/XP
in VISUAL C++, VISUAL BASIC and BORLAND DELPHI
Dimensions Approx. 190 mm × 100 mm For more information, see the IK
220data
sheet.
58
HEIDENHAIN Measuring and Testing Equipment
For Incremental Encoders
PWM 9
Inputs Expansion modules (interface boards) for 11 µAPP; 1 VPP;
TTL; HTL; EnDat*/SSI*/commutation signals
*No display of position values or parameters
Features • Measures signal amplitudes, current consumption,
operating voltage, scanning frequency
• Graphically displays incremental signals, (amplitudes,
phase angle and on-off ratio) and the reference mark signal
(width and length)
• Display symbols for reference mark, fault detection
signal, counting direction
• Universal counter, interpolation selectable
from 1 to 1024-fold
• Adjustment aid for exposed encoders
Outputs • Inputs are fed through for subsequent electronics
• BNC sockets for connection to an oscilloscope
Power supply 10 to 30 V, max 15W
Dimensions 150 mm × 205 mm × 96 mm
For Absolute Encoders
IK 115
Encoder input EnDat (absolute value and incremental signals) or SSI
Interface ISA bus
Application software Operating system: Windows 95/98
Functions: Display position value
Counter for incremental signals
EnDat functionality
Signal subdivision
for incremental signals
Up to 1024-fold
Dimensions 158 mm x 107 mm
The IK 115 is a PC expansion card for
monitoring and testing absolute
HEIDENHAIN encoders with EnDat or SSI
interface. Parameters can be read and
written via the EnDat interface.
The PWM 9 is a universal measuring device
for checking and adjusting HEIDENHAIN
incremental encoders. There are different
expansion modules available for checking
the different encoder signals. The values
can be read on an LCD monitor. Soft keys
provide ease of operation.
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