Agilent AEDL Series Optical Linear
Incremental Encoder
Features
••
••
•Insensitive to dirt/contamination
••
••
•Large mounting tolerance
••
••
•Analog or digital output signals
••
••
•Self-adhesive mounting profile
••
••
•Simple and easy assembly
••
••
•5 – 2200 mm measuring length
••
••
•Traversing speed of up to 16 m/s
••
••
•0.05 µµ
µµ
µm*, 0.1 µµ
µµ
µm*, 0.5 µµ
µµ
µm, 1 µµ
µµ
µm,
5 µµ
µµ
µm and 10 µµ
µµ
µm resolutions
••
••
•40 µm grating period (pitch)
••
••
•± 3 µµ
µµ
µm or ± 5 µµ
µµ
µm (per meter)
accuracy class
••
••
•0 °C to +55 °C temperature range
••
••
•Single 5V supply
••
••
•Up to 3 m cable length
Description
The AEDL Series linear
encoders use high technology
transmissive optical encoding
technique to detect linear
motion. There is no mechanical
contact between the scanning
head and the linear scale, thus
eliminating error due to
frictions and alignment errors.
Basically, the encoder consists
of a precision linear glass
scale and a scanning head,
which translate the linear
position into analog and digital
electrical signals. The encoder
can be easily aligned and
installed using the provided
spacer-clip and the self-
adhesive mounting feature.
Using Agilent’s Quick Stick™
method, the encoder profile
can be easily adjusted while
the system is aligned to the
machine system. The Quick
Stick™ method provides
spacing foam that prevents the
encoder profile from sticking
to the machine base until the
alignment has been performed.
A pair of L-pins (setting pins)
ensured that the scanning head
is fixed at a nominal position
while the linear encoder is
aligned and mounted to the
machine system.
With state of the art
technologies, Agilent’s linear
encoders provide an ideal
feedback control to high
precision motion systems. The
linear encoders are available
in two colors, silver or black
anodized.
Applications
The AEDL Series linear
encoder provides linear motion
detection, delivering an
accurate and insensitive
closed-loop control solution.
Typical applications:
•XY table positioning
•high precision machines
•industrial plotter
•high-accuracy measurements
•linear motors
•robotics
•electronics assembly and
inspection
Note: Agilent Technologies
encoders are not recommended
for use in safety critical
applications, e.g. life support
systems and critical care
medical equipment. Please
contact sales representative if
more clarification is needed.
ESD WARNING: NORMAL HANDLING PRECAUTIONS SHOULD BE TAKEN TO AVOID STATIC DISCHARGE.
2
Theory of Operation
Agilent Technologies utilizes an
ultra collimated LED as the
light source for the AEDL
linear encoders, where very
high modulation can be
achieved. A 22-element
photodiode array in the
scanning head detects the
modulated light. A high
technology signal-conditioning
IC is integrated inside the
scanning head. The IC
performs real time phase,
amplitude and offset signal
monitoring, which will correct
any deviation from the
expected mathematical signal
that is caused by
environmental influence.
Consequently, a high purity
sinusoidal signal is available
for interpolation process,
which is performed in the
same IC. A world-class high
precision measurement system
is thus achieved through
Agilent’s linear encoders.
Output incremental signal can
be specified as either digital
(RS422) or 1 Vpp analog
sinusoidal when ordering.
Signals of Channel A and
Channel B are 90°e phase-
shifted. Index marks are
periodically spaced at a
distance of 50 mm, or distance
coded at 500 x pitch size*.
Fault detection signal is
activated when improper
operation occurs, such as
power cutoff, loss of light
source or heavy contamination.
This signal can be used to
shut down machine operation
safely, when a failure occurs.
Definitions
Resolution: Smallest movement
detectable by the encoder. It is
normally expressed in units of
distance (e.g. 0.5 µm or
100nm).
Accuracy: A measure of how
close the output is to where it
should be. It is usually
expressed in units of distance
over the scale length (e.g. +/-
3µm per meter) or a percent
of nominal resolution.
Interpolation: An electronic
technique for increasing the
resolution from the optical
cycles on the linear scale to a
higher number of quadrature
square waves per unit length.
These square waves can then
be further quadrature decoded.
Quadrature: This term refers
to the 90-electrical-degree (1/4
of a cycle) phase relationship
between the A and B channels
of incremental encoder output.
Quadrature Decode: Also
known as 4X Decode, it refers
to the common practice of
counting all 4 quadrature
states (or square wave
transitions) per cycle of
quadrature square waves.
Thus, a linear encoder with a
cycle width of 40µm, for
example, has a resolution of
10 µm.
Pitch: Also known as grating
or optical period, it refers to
the distance for a single
window-bar pair on the linear
scale.
Measurement Length (ML):
The effective measurement
length that the encoder system
can be used for.
Index Signal: A once-per-scale
output or multiple outputs at
certain fixed locations. It is
used to establish a reference
to a known home or starting
position. Also known as
reference mark, home, or Z.
* Note: 0.05 µm and 0.1 µm are future options,
which are not yet available. The resolutions
stated are after interpolation and users’
quadrature decoding. Distance-coded version
will be available as a future option.
3
Outline Drawing
Description
A Start of measuring length
B Distance between the mounting screw holes
C Cable diameter
D Overall length of measuring system (ML + 34 mm)
E Mounting surface with high strength adhesive tape type TESA 4965
F Output signal (RS422A digital or analog 1 Vpp)
G Initial position of scanning head when ready for installation (available on the opposite side upon request)
H Mounting surface to machine parts
Tape Mounting Version
A
C
B
D E
H
G
F
4
12-pin Round Connector
15-pin D-Sub Connector (male)
PIN Analog (1 VPP) Digital RS 422 Cable color
1Cosine negative, U
2- Channel B negative, Z2- Pink
2 Power supply, +5V Power supply, +5V White/Green
3 Index Positive, U0+ Index positive, Z0+ Red
4 Index negative, U0- Index negative, Z0- Black
5Sine positive, U
1+ Channel A positive, Z1+ Brown
6Sine negative, U
1- Channel A negative, Z1- Green
7 NC Error, active low Purple
8Cosine positive, U
2+ Channel B positive, Z2+ Grey
9 NC Error, active high Yellow
10 0V 0V Brown/Green
11 0V 0V -
12 +5V +5V -
Shell Shield Shield -
PIN Analog (1 VPP) Digital RS 422 Cable color
1NC NC -
2NC NC -
3 NC Error , active low Purple
4 Index negative, U0- Index negative, Z0- Black
5Cosine negative, U
2- Channel B negative, Z2- Pink
6Sine negative, U
1- Channel A negative, Z1- Green
7NC NC -
8 Power supply, +5V Power supply, +5V White/Green
9 0V 0V Brown/Green
10 NC Switch White
11 NC Error, active high Yellow
12 Index Positive, U0+ Index positive, Z0+ Red
13 Cosine positive, U2+ Channel B positive, Z2+ Grey
14 Sine positive, U1+ Channel A positive, Z1+ Brown
15 NC NC Blue
Shell Shield Shield -
Connector Pin Configuration
Four options of connector types are available, namely the 12-pin heavy-duty industrial, 15-pin D-
Sub, 9-pin D-Sub or strand wire options. Table 1 shows the pins configuration and cable color for
the respective connector types. There are also options of either left or right cable exit for the
cable.
5
9-pin D-Sub Connector (male)
PIN Option analog (1 VPP) Option digital RS 422 Cable color
1Sine negative, U
1- Channel A negative, Z1- Green
2 0V 0V Brown/Green
3Cosine negative, U
2- Channel B negative, Z2- Pink
4 NC Error , active low Purple
5 Index negative, U0- Index negative, Z0- Black
6Sine positive, U
1+ Channel A positive, Z1+ Brown
7 Power supply, +5V Power supply, +5V White/Green
8Cosine positive, U
2+ Channel B positive, Z2+ Grey
9 Index Positive, U0+ Index positive, Z0+ Red
Shell Shield Shield -
Strand Wire Option
Cable color Analog (1 VPP) Digital RS 422
White/Green Power supply, +5V Power supply, +5V
Brown/Green 0V 0V
Red Index Positive, U0+ Index positive, Z0+
Black Index negative, U0- Index negative, Z0-
Brown Sine positive, U1+ Channel A positive, Z1+
Green Sine negative, U1- Channel A negative, Z1-
Grey Cosine positive, U2+ Channel B positive, Z2+
Pink Cosine negative, U2- Channel B negative, Z2-
Purple NC Error, active low
Yellow NC Error, active high
White NC NC
Blue NC NC
6
Absolute Maximum Ratings
Recommended Operating Conditions
Mechanical Data
Electrical Data
Storage temperature, TS-20 °C to + 70 °C
Operating temperature, TA0 °C to + 55 °C
Supply voltage, VCC 4.5 V to 5.5V
Digital output voltage, VO-0.3V to Vcc +0.3V
Storage temperature, TS-20 °C to + 70 °C
Operating temperature, TA0 °C to + 55 °C
Supply voltage, VCC 5 V ± 10 %
Analog output voltage, VO1 V ± 0.2V at 120 Ω load
Digital output voltage, VO5 V ± 10 % (RS422 compatible)
Output current per channel, IOUT 15 mA, short circuit proof (analog)
40 mA, short circuit proof (digital)
Cross section (scanning head) 31.5 × 20.2 mm (height × width)
Mass (scanning head without cable) 15 g
Mass (overall system) Mass of scanning head + 38 g/m
Maximum speed (0.5 µm resolution) 3.0 m/s
(1.0 µm resolution) 8.0 m/s
(5.0 and 10 µm resolutions) 16.0 m/s
(1Vpp analog output) 16.0 m/s
Measuring scale material Precision float glass
Thermal expansion coefficient (Glass scale) 7.8 × 10-6 K-1
(Scale with profile) 13.1 × 10-6 K-1
Extrusion profile material Tempered precision Aluminum, anodized
Light source Ultra collimated LED
Detector 22-element photodetectors array
Maximum analog signal frequency (-3 dB) 400 kHz
Maximum power consumption with load (digital output) 200 mA
(analog output) 100 mA
7
0˚
135˚
360˚
Signal period 360˚e
U
1
0
0
0
U
2
U
0
R
B R
F
R
A
S
L
C
L
C
U
S
U
C
A
S
A
φ
φ12
Figure 1. Output waveforms for analog output signals. Shown signals are measured in difference mode
Output Characteristics
Analog Output Signals (Sine U1, Cosine U2 and Index U0)
Analog Signals
Sine U1, Cosine U2
Peak-peak amplitude (SA, CA)1.0 ± 0.2 V
Offset |SU-SL|/(2*SA) or |CU-CL|/(2*CA)≤ 0.05
Ratio SA /CA1.0 ± 0.1
Phase |φ1+φ2|/2 90° ± 10° e
Index Channel U0
Signal amplitude RA1.0 +1.6 V
-0.6
Index signal zero-crossover width RB, RF180° ± 90°e
8
Digital Incremental Signals, RS422 compatible
Digital Output Signal for Options N & P (Ch. A, Ch. B and Index)
Figure 2. Digital output signals, with a quadrature phase-shift between Ch. A and Ch. B. The index pulse, which is active for 90° e, is gated with
the incremental signals.
0˚ 360˚
A
0
0
0
B
Index
: Phase-shift
R
L
Z
1+
Z
2+
Z
0+
One cycle
φφ
Channel A & B
Phase-shift 90° e
Rise/Fall time ≤ 40 ns
Index Channel
Index pulse width, RL90° e
Rise/Fall time ≤ 40 ns
9
Interpolated Digital Output Signal (Ch. A, Ch. B, Index and Error)
0˚
360˚e
Analog Signal Period
A
0
0
0
0
B
Index
Error
One count (90 ºe)
One cycle of square wave signal
R
L
Z
1+
Z
2+
Z
0+
Figure 3. Interpolated digital output signals (A, B, and Index) and the error signal. The analog signal period corresponds to a 40-µµ
µµ
µm distance.
Digital Incremental Signals, RS422 compatible
Note:
Error signal is non-active for normal operation while an activated Error signal indicates that a fault is detected. Typical cause is due to power failure, loss
of encoder light source or encoder signals are out of the limit.
Channel A & B
Phase-shift 90° e
Rise/Fall time ≤ 40 ns
Index Channel
Index pulse width, RL90° e
Rise/Fall time ≤ 40 ns
Error Channel
Error Active high
Error Active Low
10
X
Y
Z
X
Y
Z
∆ϕ
∆ϕ
∆ϕ
Figure 4. Definition of axes and rotational angles for the total allowable tolerance of the linear encoder
Test Name Reference Conditions
Vibration (non-operating) DIN IEC 68-2-6 50 Hz - 2 kHz, 10g/15g/30g, 10 cycles in 3 axes
50 Hz - 2 kHz, 30g, 1 cycle (Glass scale only)
Shock (non-operating) DIN IEC 68-2-27 10 g, 6 ms, 2000 shocks in 6 directions
20 g, 11 ms, 1000 shocks in 6 directions
50 g, 3 ms, 500 shocks in 6 directions
Electromagnetic Compatibility (EMC) DIN EN61000-6-2 Industrial Environment Immunity Test
DIN EN61000-4-2 Electrostatic Discharge (ESD): Discharge in air (± 8 kV) and
contact discharge (± 4 kV)
DIN EN61000-4-3 Electromagnetic RF-field in the range of 80 MHz to 1000
MHz, 80 % AM, 1 kHz
DIN EN61000-4-4 Fast transient (bursts, ± 1 kV)
DIN EN61000-4-6 RF-coupling into power line in the range of 0.15 to 80 MHz,
80 % AM, 1 kHz
Error Description Tolerance
∆yTotal tolerance in the y-axis ± 70 µm
∆zTotal tolerance in the z-axis ± 50 µm
∆ϕXRoll angle, rotation about the x-axis ± 50 '
∆ϕYPitch angle, rotation about the y-axis ± 50 '
∆ϕZYaw angle, rotation about the z-axis ± 25 '
Mechanical and Environmental Test
The encoders are tested according to the following international standards to ensure that they can
withstand the most stringent environmental requirements.
Allowable Mounting and Machine Tool Tolerances
With reference to Figure 4, the total tolerances for the linear encoder are given as:
11
Recommended circuit
Digital RS422 interpolated output signals
Analog 1 VPP Voltage signals
Figure 5. Recommended receiver circuits for the line driver digital output. The same circuit is
applicable for Ch. A, Ch. B, Index, and Error channels.
Figure 6. Recommended customer receiver circuit for analog output sine, cosine, and index signals.
+5V
120 Ω
Z1+ Z1+
Z1- Z1-
Encoder/Line driver
Cable
Line Receiver
(AM26LS32, DS26LS32)
+Ub
-Ub
Encoder
Cable
Customer circuit
0V
+
-
U
120 Ω
12
Figure 7. Cable bending radius for fixed and flexible installations
R
R
R
R
R
R
Fixed installation Flexible movement
Diameter 4 mm
Cable structure Twisted pairs with common shield
Number of cable cores 12 (1 pair of AWG 28 for power supply, and 5 pairs of AWG 30 for signal lines)
Cable Characteristics
Fixed installation Frequent flexing
Permissible bending radius, R R ≥ 12 mm (0.48 in.) R ≥ 40 mm (1.6 in.)
The cable complies with UL standard 20963. Operating conditions for the cable depend on the
cable diameter and the cable configuration. The operating conditions are given in the following
table:
13
Ordering Information
Measurement Length (mm)
0220 220
0270 270
0320 320
0370 370
0420 420
0470 470
0520 520
0620 620
0720 720
0770 770
0820 820
0920 920
1020 1020
1240 1240
1440 1440
1640 1640
1840 1840
Color
0 Silver
1 Black
Limit Switch (Not yet available),
Index Mark
A With switch, Every 50mm *
B
With switch, Distance
Coded *
C Without switch, Every 50mm
D
Without switch, Distance
Coded *
Cable Length (m/Inch),
Cable Exit
0 0.5/19.7, left
1 0.5/19.7, right
2 1.0/39.4, left
3 1.0/39.4, right
4 2.0/78.8, left
5 2.0/78.8, right
6 3.0/118.2, left
7 3.0/118.2, right
Connector
A Plain cable, stranded wires
B 9-pin D-Sub male
C 15-pin D-Sub male
D 12-pin round
AEDL
2040 2040
2200 2200
Custom-Contact Distributor
Accuracy per
meter (µm)
A Digital 0.05 3 *
B Digital 0.05 5 *
C Digital 0.1 3 *
D Digital 0.1 5 *
E Digital 0.5 3
F Digital 0.5 5
G Digital 1 3
H Digital 1 5
L Digital 5 3
M Digital 5 5
N Digital 10 3
P Digital 10 5
QAnalog (40µm pitch) 3
Output Options and
Resolution (µm)
SAnalog (40µm pitch) 5
Note: Options with * are not available yet
www.agilent.com/
semiconductors
For product information and a complete list
of distributors, please go to our web site.
For technical assistance call:
Americas/Canada: +1 (800) 235-0312
or (408) 654-8675
Europe: +49 (0) 6441 92460
China: 10800 650 0017
Hong Kong: (+65) 6756 2394
India, Australia, New Zealand: (+65) 6755 1939
Japan: (+81 3) 3335-8152(Domestic/Inter-
national), or 0120-61-1280(Domestic Only)
Korea: (+65) 6755 1989
Singapore, Malaysia, Vietnam, Thailand,
Philippines, Indonesia: (+65) 6755 2044
Taiwan: (+65) 6755 1843
Data subject to change.
Copyright © 2005 Agilent Technologies, Inc.
March 3, 2005
5989-2553EN
