WAGO 750-637 User manual

Fieldbus Independent
I/O Modules
Incremental Encoder Interfaces
750-637, (/xxx-xxx)
Manual
Version 1.3.2

ii • General
WAGO-I/O-SYSTEM 750
I/O Modules
Copyright ©2006 by WAGO Kontakttechnik GmbH & Co. KG
All rights reserved.
WAGO Kontakttechnik GmbH & Co. KG
Hansastraße 27
D-32423 Minden
Phone: [phone] – 0
Fax: [phone] – 1 69
E-Mail: [email protected]
Web: http://www.wago.com
Technical Support
Phone: [phone] – 5 55
Fax: [phone] – 85 55
E-Mail: [email protected]
Every conceivable measure has been taken to ensure the correctness and com-
pleteness of this documentation. However, as errors can never be fully
excluded, we would appreciate any information or ideas at any time.
E-Mail: [email protected]
We wish to point out that the software and hardware terms as well as the
trademarks of companies used and/or mentioned in the present manual are
generally trademark or patent protected.

Contents •iii
WAGO-I/O-SYSTEM 750
I/O Modules
Contents
1Important Comments ................................................................................. 4
1.1 Legal Principles........................................................................................4
1.1.1 Copyright............................................................................................. 4
1.1.2 Personnel Qualification .......................................................................4
1.1.3 Intended Use ........................................................................................4
1.2 Symbols....................................................................................................5
1.3 Number Notation......................................................................................5
1.4 Safety Notes .............................................................................................6
1.5 Scope ........................................................................................................6
2I/O Modules ................................................................................................. 7
2.1 Special Modules .......................................................................................7
2.1.1 Overview Incremental Encoder Interfaces 750-637, (/xxx-xxx).........7
2.1.2 750-637 [Inc.Enc./RS422/32Bit/Diff.] ................................................8
2.1.2.1 View................................................................................................8
2.1.2.2 Variations........................................................................................8
2.1.2.3 Description......................................................................................8
2.1.2.4 Display Elements ..........................................................................10
2.1.2.5 Schematic Diagram.......................................................................10
2.1.2.6 Technical Data ..............................................................................11
2.1.2.7 Functional Description.................................................................. 13
2.1.2.8 Process Image ...............................................................................14
2.1.3 750-637/000-001 [Inc.Enc./24V/32Bit/Diff.]....................................18
2.1.3.1 View..............................................................................................18
2.1.3.2 Description....................................................................................18
2.1.3.3 Display Elements ..........................................................................20
2.1.3.4 Schematic Diagram.......................................................................20
2.1.3.5 Technical Data ..............................................................................21
2.1.3.6 Functional Description.................................................................. 23
2.1.3.7 Process Image ...............................................................................24
2.1.4 750-637/000-002 [Inc.Enc./24V/32Bit/S.E.].....................................28
2.1.4.1 View..............................................................................................28
2.1.4.2 Description....................................................................................28
2.1.4.3 Display Elements ..........................................................................30
2.1.4.4 Schematic Diagram.......................................................................30
2.1.4.5 Technical Data ..............................................................................31
2.1.4.6 Functional Description.................................................................. 33
2.1.4.7 Process Image ...............................................................................34

4 • Important Comments
Legal Principles
WAGO-I/O-SYSTEM 750
I/O Modules
1 Important Comments
To ensure fast installation and start-up of the units described in this manual,
we strongly recommend that the following information and explanations are
carefully read and abided by.
1.1 Legal Principles
1.1.1 Copyright
This manual is copyrighted, together with all figures and illustrations
contained therein. Any use of this manual which infringes the copyright
provisions stipulated herein, is not permitted. Reproduction, translation and
electronic and photo-technical archiving and amendments require the written
consent of WAGO Kontakttechnik GmbH & Co. KG. Non-observance will
entail the right of claims for damages.
WAGO Kontakttechnik GmbH & Co. KG reserves the right to perform
modifications allowed by technical progress. In case of grant of a patent or
legal protection of utility patents all rights are reserved by WAGO
Kontakttechnik GmbH & Co. KG. Products of other manufacturers are always
named without referring to patent rights. The existence of such rights can
therefore not be ruled out.
1.1.2 Personnel Qualification
The use of the product detailed in this manual is exclusively geared to
specialists having qualifications in PLC programming, electrical specialists or
persons instructed by electrical specialists who are also familiar with the valid
standards. WAGO Kontakttechnik GmbH & Co. KG declines all liability
resulting from improper action and damage to WAGO products and third party
products due to non-observance of the information contained in this manual.
1.1.3 Intended Use
For each individual application, the components supplied are to work with a
dedicated hardware and software configuration. Modifications are only
permitted within the framework of the possibilities documented in the
manuals. All other changes to the hardware and/or software and the non-
conforming use of the components entail the exclusion of liability on part of
WAGO Kontakttechnik GmbH & Co. KG.
Please direct any requirements pertaining to a modified and/or new hardware
or software configuration directly to WAGO Kontakttechnik GmbH & Co.
KG.

Important Comments •5
Symbols
WAGO-I/O-SYSTEM 750
I/O Modules
1.2 Symbols
Danger
Always abide by this information to protect persons from injury.
Warning
Always abide by this information to prevent damage to the device.
Attention
Marginal conditions must always be observed to ensure smooth operation.
ESD (Electrostatic Discharge)
Warning of damage to the components by electrostatic discharge. Observe
the precautionary measure for handling components at risk.
Note
Routines or advice for efficient use of the device and software optimization.
More information
References on additional literature, manuals, data sheets and INTERNET
pages
1.3 Number Notation
Number Code Example Note
Decimal 100 normal notation
Hexadecimal 0x64 C notation
Binary '100'
'0110.0100'
Within ',
Nibble separated with dots

6 • Important Comments
Safety Notes
WAGO-I/O-SYSTEM 750
I/O Modules
1.4 Safety Notes
Warning
Switch off the system prior to working on bus modules!
In the event of deformed contacts, the module in question is to be replaced, as
its functionality can no longer be ensured on a long-term basis.
The components are not resistant against materials having seeping and
insulating properties. Belonging to this group of materials is: e.g. aerosols,
silicones, triglycerides (found in some hand creams).
If it cannot be ruled out that these materials appear in the component
environment, then additional measures are to be taken:
- installation of the components into an appropriate enclosure
- handling of the components only with clean tools and materials.
Attention
Cleaning of soiled contacts may only be done with ethyl alcohol and leather
cloths. Thereby, the ESD information is to be regarded.
Do not use any contact spray. The spray may impair the functioning of the
contact area.
The WAGO-I/O-SYSTEM 750 and its components are an open system. It
must only be assembled in housings, cabinets or in electrical operation
rooms. Access must only be given via a key or tool to authorized qualified
personnel.
The relevant valid and applicable standards and guidelines concerning the
installation of switch boxes are to be observed.
ESD (Electrostatic Discharge)
The modules are equipped with electronic components that may be destroyed
by electrostatic discharge. When handling the modules, ensure that the
environment (persons, workplace and packing) is well grounded. Avoid
touching conductive components, e.g. gold contacts.
1.5 Scope
This manual describes the special modules 750-637, (/xxx-xxx)
Incremental Encoder Interfaces of the modular WAGO-I/O-SYSTEM 750.
Handling, assembly and start-up are described in the manual of the Fieldbus
Coupler. Therefore this documentation is valid only in the connection with the
appropriate manual

Overview Incremental Encoder Interfaces 750-637, (/xxx-xxx) •7
WAGO-I/O-SYSTEM 750
I/O Modules
2 I/O Modules
2.1 Special Modules
2.1.1 Overview Incremental Encoder Interfaces 750-637, (/xxx-xxx)
I/O Module 750-637 750-637/
000-001
750-637/
000-002
750-637/
000-003
Function Incremental
Encoder
Interface
Incremental
Encoder
Interface
Incremental
Encoder
Interface
Incremental
Encoder
Interface
Input differential differential single ended differential
Sensor Operation
Voltage
DC 5 V DC 24 V DC 24 V DC 5 V
Interpretation fourfold fourfold fourfold single
Bit Width 32 Bit 32 Bit 32 Bit 32 Bit

8 • 750-637 [Inc.Enc./RS422/32Bit/Diff.]
View
WAGO-I/O-SYSTEM 750
I/O Modules
2.1.2 750-637 [Inc.Enc./RS422/32Bit/Diff.]
Incremental encoder interface RS422 / 32 bit / differential
2.1.2.1 View
+-
LG
RS
15 16
C
D
B
A
CC
Ue Uo
13 14
C
D
B
A
750-637
BB
AA
N1 N2
C
A
B
Latch
A
A
B
B
C
C
5V
0V
Gate
Latch
N2
N1
0V
24V
N1
N2
Gate
Ref
Ref
Data contacts
Shield (screen)
Sensor supply
Fig. 2.1.2-1: View g063700e
2.1.2.2 Variations
Item-No. Designation Description
750-637 Inc.Enc./RS422/32Bit/
Diff.
Incremental Encoder Interface RS422 /
32 Bit / differential / fourfold interpretation
750-637/000-003 Inc.Enc./RS422/32Bit/
Diff./Single Interpret.
Incremental Encoder Interface RS422 /
32 Bit / differential / single interpretation
2.1.2.3 Description
The I/O module 750-637 represents an interface for any type of incremental
encoder with an RS 422 connection.
The data width of the encoder module is 32 bits. Either the current counter
reading, the latch value, the set value or the current speed can be mapped into
the process data.

750-637 [Inc.Enc./RS422/32Bit/Diff.] •9
Description
WAGO-I/O-SYSTEM 750
I/O Modules
Inputs/Outputs
A, /A, B, /B Quadrature input, RS 422
C, /C Zero reference input, RS 422
Latch, Gate, Ref Input, 24 V
N1, N2 Output, 24 V
A counter with quadrature decoder and a latch for the zero pulse can be read
and activated by the PLC. The PLC is able to set the counter. Depending on
the operating mode, the counter reading is taken into the latch register, if the
edge at input “C” or “Latch” is positive.
The speed (increments/ms) is automatically recorded and can be transmitted as
an alternative to the latch value.
The „Gate” input allows to lock the counter. The „Ref” input can be set to
activate the zero mark „C”.
The cam outputs N1 and N2 indicate whether the counter value is within a
defined range of values. The range can be adjusted for each cam via the PLC.
Starting with the software version XXXX03XX, the cam outputs can be
disabled by the PLC and the states of the cam outputs can be queried.
24 V DC is required to supply the I/O modules, from this voltage also the
voltage supply to the encoder (Ue, U0) is branched/tapped.
Attention
This module has no power contacts. For field supply to downstream I/O
modules, a supply module will be needed.
The shield (screen) is directly connected to the carrier rail.
The module 750-637 can be used with all couplers/controllers of the
WAGO-I/O-SYSTEM 750 (except for the economy types 750-320, -323, -324
and -327).
The version of both hardware and software that are valid for this module is
specified in the manufacturing number, which is part of the lateral marking on
the module.

10 • 750-637 [Inc.Enc./RS422/32Bit/Diff.]
Display Elements
WAGO-I/O-SYSTEM 750
I/O Modules
2.1.2.4 Display Elements
LED Designation Status Function
off U(A) - U(/A) < -0,2 V
A1
green A on U(A) - U(/A) > 0,2 V
or both inputs open
off U(C) - U(/C) < -0,2 V
B1
green C on U(C) - U(/C) > 0,2 V
or both inputs open
off U(B) - U(/B) < -0,2 V
C1
green B on U(B) - U(/B) > 0,2 V
or both inputs open
off Input = 0 V or open
D1
green Latch on Input = 24 V
off Input = 0 V or open
A2
green Gate on Input = 24 V
off Output = 0 V
B2
green N1 on Output = 24 V
off Input = 0 V or open
C2
green Ref on Input = 24 V
off Output = 0 V
15 16
C
D
B
A
13 14
C
D
B
A
B1
A1
C1
D1
B2
A2
C2
D2
Fig. 2.1.2-2: Display
elements g063702x
D2
green N2 on Output = 24 V
2.1.2.5 Schematic Diagram
24V/0V A B C
N1
/N2
Ve/V 0
N1/N2
Latch/Gate
N1/N2
Gate/Ref
DC
DC
Logic
A/A
_
B/B
_
C/C
_
Ref/Shield
(screen)
Latch
ABC
U
0
Ue
___
Gate
/Ref
A,B,C
0V
24V
Latch
Shield
(screen)
1
2
3
4
5
6
7
8
750-637
1
2
3
4
5
6
7
8
DC
DC
Fig. 2.1.2-2: Schematic Diagram g063701e

750-637 [Inc.Enc./RS422/32Bit/Diff.] •11
Technical Data
WAGO-I/O-SYSTEM 750
I/O Modules
2.1.2.6 Technical Data
Module specific Data
Sensor connection A, /A, B, /B, C, /C (/A, /B, /C are inversed)
Current consumption (internal) 110 mA
Counter 32 bits binary
Operation Mode Capture 32 bits
Operation Mode Preload 32 bits
Quadrature decoder fourfold interpretation (750-637)
single interpretation (750-637/000-003)
Zero impulse latch 32 bits
Commands read, write, activate
Velocity 16 Bit (increments per 1ms)
Max. operating frequency 250 kHz
Time constant input LATCH 364 µs
Time constant input GATE 32 µs
Time constant input REF 32 µs
Power supply DC 24 V (- 15 % ... + 20 %)
Current consumption (24 V) 12 mA (without sensor and without load)
Sensor Operation voltage DC 5 V
Sensor Output current max 300 mA
Internal bit width 1 x 32 bits data
2 x 8 bits control / status
Dimensions W x H* x L
* from upper edge of DIN 35 rail
24 mm x 64 mm x 100 mm
Weight ca. 105 g
Digital Outputs (N1, N2)
Output voltage DC 24 V
Output current max. 0,5 A short-circuit-protected
Output resistance typ. 160 mΩ
Digital Inputs (Latch, Gate, Ref)
Input voltage (0) DC –3 V ... +5 V
(1) DC +15 V ... +30 V
Input current typ. Latch: 5 mA
Gate and Ref: 7 mA

12 • 750-637 [Inc.Enc./RS422/32Bit/Diff.]
Technical Data
WAGO-I/O-SYSTEM 750
I/O Modules
Quadrature Inputs (A, /A, B, /B, C, /C)
Input voltage A, /A (0) U(A) - U(/A) < -0,2 V
(1) U(A) - U(/A) > 0,2 V
Input voltage B, /B (0) U(B) - U(/B) < -0,2 V
(1) U(B) - U(/B) > 0,2 V
Input voltage C, /C (0) U(C) - U(/C) < -0,2 V
(1) U(C) - U(/C) > 0,2 V
Standards and Regulations (cf. Chapter 2.2 of the Coupler/Controller Manual)
EMC-Immunity to interference (CE) acc. to EN 50082-2 (96)
EMC-Emission of interference (CE) acc. to EN 50081-1 (93)
Approvals (cf. Chapter 2.2 of the Coupler/Controller Manual)
CULUS (UL508)
CULUS (UL1604) Class I Div2 ABCD T4A
DEMKO II 3 GD EEx nA II T4
Conformity Marking
More Information
Detailed references to the approvals are listed in the document "Overview
Approvals WAGO-I/O-SYSTEM 750", which You can find on the CD ROM
ELECTRONICC Tools and Docs (Item-No.: 0888-0412/…) or in the Internet
under:
www.wago.com -> Service /Downloads /Documentation
/WAGO-I/O-SYSTEM 750/System Description/.
Further „General Technical Data“ for the WAGO-I/O-SYSTEM 750 is
available in the specific fieldbus coupler / controller manuals.

750-637 [Inc.Enc./RS422/32Bit/Diff.] •13
Functional Description
WAGO-I/O-SYSTEM 750
I/O Modules
2.1.2.7 Functional Description
Typically, incremental encoders supply two output signals of the encoder
track, both 90° offset. These signals are designated A and B. To improve the
common mode interference suppression, both signals are transmitted as
differential signals. In additional to the A signal, also the inverted /A level is
transmitted. The difference of the input signals is evaluated in the incremental
encoder I/O module. The phase position changes from A to B by changing A
and /A. In this manner, it is possible to pre-define the desired counting
direction by wiring.
Usually, incremental encoders have an index track in addition to the two track
signals. This index track only produces one pulse per one full encoder
revolution. This pulse and the counter reading can be used to determine the
absolute encoder position during rotation. The index pulse has a duration of a
track position pulse. We recommend to always have the latch process
performed in the same rotational direction.
Input Function
A, /A, B, /B Quadrature input, RS 422
Increment pulse signal channel A or B of the Incremental Encoder
C, /C Zero reference input, RS 422
Incremental encoder index pulse
Dependent on the operating mode, the counter reading is taken over
into the latch register or the counter showing the set value is
additionally loaded, if the input edge is positive.
LATCH LATCH input 24 V
Dependent on the operating mode, the counter reading is taken into the
latch register or the counter showing the set value is additionally
loaded, if the input edge is positive.
GATE GATE input, 24 V
The counting process is locked if 24 V is applied to input GATE.
REF REF input, 24 V
During a reference run, the index pulse is only evaluated in conjunction
with an additional sensor signal (Ref).
Screen (Shield) Connection for the encoder line screen
The screen connection is directly routed to the carrier rail.
Ue (+5V) 5 V supply output for the sensor
U0(0V) Ground for the sensor signal and supply, internally connected with 0 V
+24V 24 V supply voltage for the module
0V Ground for the 24 V supply voltage,
internally connected with U0.
Output Function
N1, N2 Cam output, 24 V, 0.5 A
"1" - Counter value is within of the defined range
"0" - Counter value is outside of the defined range

14 • 750-637 [Inc.Enc./RS422/32Bit/Diff.]
Process Image
WAGO-I/O-SYSTEM 750
I/O Modules
2.1.2.8 Process Image
Using the I/O module 750-637, a 6 byte input and output process image can be
transferred to the fieldbus coupler / controller via two logical channels.
The set values are stored in 4 output bytes (D0, D1, D2, D3) and the process
data are stored in 4 input bytes (D0, D1, D2, D3). Two control bytes (C0, C1)
and two status bytes (S0, S1) are used to select process data and set values as
well as to control the data flow.
Attention
The representation of the process data of some I/O modules or their variations
in the process image depends on the fieldbus coupler/-controller used. Please
take this information as well as the particular design of the respective
control/status bytes from the section "Fieldbus Specific Design of the Process
Data" included in the description concerning the process image of the
corresponding coupler/controller.
Input data Output data
S0 Status byte S0 C0 Control byte C0
D0 Process data byte 0 (LSB) D0 Set value byte 0 (LSB)
D1 Process data byte 1 D1 Set value byte 1
S1 Status byte S1 C1 Control byte C1
D2 Process data byte 2 D2 Set value byte 2
D3 Process data byte 3 (MSB) D3 Set value byte 3 (MSB)
Bit 0 and bit 1 in the control byte C1 determines the process data.
• Counter value
• Latch value
• Velocity
• Set value
The setting is mirrored in status byte S1 in bit 0 and bit 1.
MapPZD (Control Byte C1 / Status Byte S1, Bit 0 and 1)
Bit 1 Bit 0 Coding of the Process data
0 0 Counter value
0 1 Latch value
1 0 Velocity (Increments per milliseconds)
1 1 Set value

750-637 [Inc.Enc./RS422/32Bit/Diff.] •15
Process Image
WAGO-I/O-SYSTEM 750
I/O Modules
Status Byte S0
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
0 X AckSet
LoadExt
OVER-
FLOW
UNDER-
FLOW
CNT_
SET_
ACK
LAT_
EXT_
VAL
LATC_
VAL
LATC_
VAL
Acknowledge bit for EN_LATC (C0.0).
Latch Mode: This bit is set with a positive edge at input C.
It is reset when EN_LATC is reset.
Preload Mode: This bit is set with a positive edge at C.
It is reset when EN_LATC is reset.
LAT_
EXT_
VAL
Acknowledge bit for EN_LAT_EXT (C0.1).
Latch Mode: This bit is set with a positive edge at the input Latch.
It is reset when EN_LAT_EXT is reset.
Preload Mode: This bit is set with a positive edge at the input Latch.
It is reset when EN_LAT_EXT is reset.
CNT_
SET_
ACK
Acknowledge bit for CNT_SET (C0.2).
Reset if CNT_SET=0
UNDER-
FLOW
UNDERFLOW=1 with a counter overflow of 0x00000000 to 0xffffffff
UNDERFLOW=0 if counter < 0xAAAAAAAA
UNDERFLOW=0 if positive edge ResetUnderflow (C1.3)
UNDERFLOW=0 if OVERFLOW=1
OVER-
FLOW
OVERFLOW=1 with a counter overflow of 0xffffffff to 0x00000000
OVERFLOW=0 if counter > 0x55555555
OVERFLOW=0 if positive edge ResetOverflow (C1.4)
OVERFLOW=0 if UNDERFLOW=1
AckSet
LoadExt
Acknowledge bit for SetLoadExt.
Reset if SetLoadExt=0 (C0.5)
X reserved
0 reserved
Status Byte S1
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
0 0 N2 N1 StaN2 StaN1 MapPZD MapPZD
MapPZD Software version < XXXX03XX: reserved / not used (0)
software version ≥XXXX03XX: coding of process data (2 Bits)
StaN2 Software version < XXXX03XX: reserved / not used (0)
software version ≥XXXX03XX: state of cam output 1:
0 = cam output 1 reset, 1 = cam output 1 set
StaN1 Software version < XXXX03XX: reserved / not used (0)
software version ≥XXXX03XX: state of cam output 2:
0 = cam output 2 reset, 1 = cam output 2 set
N1 Cam window 1st bit is set, if:
bottom comparative value N1 ≤counter reading ≤top comparative value N1
N2 Cam window 2nd bit is set, if:
bottom comparative value N2 ≤counter reading ≤top comparative value N2
0 reserved

16 • 750-637 [Inc.Enc./RS422/32Bit/Diff.]
Process Image
WAGO-I/O-SYSTEM 750
I/O Modules
Control Byte C0
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
0 OpMode SetLoad
Ext
Reset
Overflow
Reset
Under-
flow
CNT_
SET
EN_
LAT_
EXT
EN_
LATC
EN_
LATC
The encoder zero mark is released.
Capture Mode: With a positive edge at input C the counter reading is
transferred to the latch register.
Preload Mode: With a positive edge at input C the counter reading is
transferred to the latch register .
The counter is loaded with the set value.
The confirmation is de-selected for the negative edge of EN_LATC.
EN_LATC is dominant against EN_LAT_EXT.
EN_
LAT_
EXT
The external latch input is released.
Capture Mode: With a positive edge at the input LATCH, the counter
reading is transferred to the latch register.
Preload Mode: With a positive edge at the input LATCH, the counter
reading is transferred to the Latch register.
The counter is loaded with the set value.
The confirmation is de-selected for the negative edge of EN_LAT_EXT.
CNT_
SET With a positive edge, the counter is initialized on the set value.
Reset
Underflow With a positive edge the status bit UNDERFLOW (S0.3) is reset.
Reset
Overflow With a positive edge the status bit OVERFLOW (S0.4) is reset.
SetLoad
Ext With a positive edge, the set value to which the counter is to be set in the case of an
external event, will be transferred to the process data.
OpMode 0=Capture Mode The counter is latched by a trigger signal
1=Preload Mode The counter is latched by a trigger signal.
Subsequently, the counter is loaded with the set value.
0 reserved

750-637 [Inc.Enc./RS422/32Bit/Diff.] •17
Process Image
WAGO-I/O-SYSTEM 750
I/O Modules
Control Byte C1
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
0 Enable
Ref
Set
Nocke2
Set
Nocke1
Dis
Nocke2
Dis
Nocke1
MapPZD MapPZD
MapPZD Coding of Process data (2 bits)
DisNocke1 Software version < XXXX03XX: reserved / not used (0)
software version ≥XXXX03XX: disable cam output 1:
0 = cam output 1 enabled, 1 = cam output 1 disabled
DisNocke2 Software version < XXXX03XX: reserved / not used (0)
software version ≥XXXX03XX: disable cam output 2:
0 = cam output 2 enabled, 1 = cam output 2 disabled
SetNocke1 With a positive edge, the set value is taken over as the bottom comparative value for
output 1 (N1).
With a negative edge, the set value is taken over as the top comparative value for
output 1 (N1).
SetNocke2 With a positive edge, the set value is taken over as bottom comparative value for
output 2 (N2).
With a negative edge, the set value is taken over as top comparative value for output 2
(N2).
EnableRef Input REF released.
- The controls set Bit EnableRef
- The controls must release EN_LATC (C1.0) or EN_LAT_EXT (C1.1) with a
positive edge
- A positive edge is created at input REF
- Subsequently, the next positive edge at input C or input Latch leads to a Capture or
Preload
event
0 reserved

18 • 750-637/000-001 [Inc.Enc./24V/32Bit/Diff.]
View
2.1.3 750-637/000-001 [Inc.Enc./24V/32Bit/Diff.]
Incremental encoder interface 24 V / 32 bit / differential
2.1.3.1 View
+ -
LG
RS
15 16
C
D
B
A
CC
13 14
C
D
B
A
750-637/000-001
BB
AA
N1 N2
C
A
B
Latch
A
A
B
B
C
CGate
Latch
N2
N1
0V
24V
N1
N2
Gate
Ref
Ref
Data contacts
Shield (screen)
Fig. 2.1.3-1: View g063710e
2.1.3.2 Description
The I/O module 750-637/000-001 represents an interface for any type of
incremental encoder with an differential 24 V connection.
The data width of the encoder module is 32 bits. Either the current counter
reading, the latch value, the set value or the current speed can be mapped into
the process data.
Inputs/Outputs
A, /A, B, /B Quadrature input, 24 V, differential
C, /C Zero reference input, 24 V, differential
Latch, Gate, Ref Input, 24 V
N1, N2 Output, 24 V
A counter with quadrature decoder and a latch for the zero pulse can be read
and activated by the PLC. The PLC is able to set the counter. Depending on
the operating mode, the counter reading is taken into the latch register, if the
edge at input “C” or “Latch” is positive.
The speed (increments/ms) is automatically recorded and can be transmitted as
an alternative to the latch value.

750-637/000-001 [Inc.Enc./24V/32Bit/Diff.] •19
Description
The „Gate” input allows to lock the counter. The „Ref” input can be set to
activate the zero mark „C”.
The I/O module signals whether the counter reading is within the defined set
points by using the cam outputs (N1, N2). The set points can be individually
set.
The I/O module requires 24 VDC power supply.
The sensor is fed with an external power supply. The sensor ground must be
connected to the 0V terminal of the module.
Attention
This module has no power contacts. For field supply to downstream I/O
modules, a supply module will be needed.
The shield (screen) is directly connected to the carrier rail.
The module 750-637/000-001 can be used with all couplers/controllers of the
WAGO-I/O-SYSTEM 750 (except for the economy types 750-320, -323, -324
and -327).
This description is valid for the XXXX0301... hardware and software version.
The version is specified in the manufacturing number, which is part of the
lateral marking on the module.

20 • 750-637/000-001 [Inc.Enc./24V/32Bit/Diff.]
Display Elements
2.1.3.3 Display Elements
LED Designation Status Function
off -30 V < (U(A) - U(/A)) < -15
V
A1
green A
on 30 V > (U(A) - U(/A)) > 15 V
or both inputs open
off -30 V < (U(C) - U(/C)) < -15 V
B1
green C on 30 V > (U(C) - U(/C)) > 15 V
or both inputs open
off -30 V < (U(B) - U(/B)) < -15 V
C1
green B on 30 V > (U(B) - U(/B)) > 15 V
or both inputs open
off Input = 0 V or open
D1
green Latch on Input = 24 V
off Input = 0 V or open
A2
green Gate on Input = 24 V
off Output = 0 V
B2
green N1 on Output = 24 V
off Input = 0 V or open
C2
green Ref on Input = 24 V
off Output = 0 V
15 16
C
D
B
A
13 14
C
D
B
A
B1
A1
C1
D1
B2
A2
C2
D2
Fig. 2.1.3-2: Display
elements g063702x
D2
green N2 on Output = 24 V
2.1.3.4 Schematic Diagram
24V/0V A B C
N1
/N2
N1/N2
Latch/Gate
N1/N2
Gate/Ref
DC
DC
Logic
A/A
_
B/B
_
C/C
_
Ref/Shield
(screen)
Latch
ABC
___
Gate
/Ref
A,B,C
0V
24V
Latch
Shield
(screen)
1
2
3
4
5
6
7
8
750-637/000-001
1
2
3
4
5
6
7
8
Fig. 2.1.3-2: Schematic Diagram g063711e