WAGO WAGO-I/O-SYSTEM 750 Series User manual

Fieldbus Independent
I/O Modules
Incremental Encoder Interfaces
750-637, (/xxx-xxx)
Manual
Version 1.4.0

ii • General
WAGO-I/O-SYSTEM 750
I/O Modules
Copyright 2008 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 Notes .......................................................................................... 5
1.1 Legal Bases...............................................................................................5
1.1.1 Copyright.............................................................................................5
1.1.2 Personnel Qualifications......................................................................5
1.1.3 Use of the 750 Series in Compliance with Underlying Provisions .....6
1.1.4 Technical Condition of Specified Devices ..........................................6
1.2 Standards and Guidelines for Operating the 750 Series...........................7
1.3 Symbols....................................................................................................8
1.4 Safety Information....................................................................................9
1.5 Font Conventions ................................................................................... 10
1.6 Number Notation....................................................................................10
1.7 Scope ........................................................................................................5
2I/O Modules ............................................................................................... 11
2.1 Special Modules ..................................................................................... 11
2.1.1 Overview Incremental Encoder Interfaces 750-637, (/xxx-xxx).......11
2.1.2 750-637 [Inc.Enc./RS422/32Bit/Diff.] .............................................. 12
2.1.2.1 Variations...................................................................................... 12
2.1.2.2 View..............................................................................................12
2.1.2.3 Description.................................................................................... 12
2.1.2.4 Display Elements ..........................................................................14
2.1.2.5 Schematic Diagram....................................................................... 14
2.1.2.6 Technical Data .............................................................................. 15
2.1.2.7 Functional Description..................................................................18
2.1.2.8 Process Image ...............................................................................19
2.1.3 750-637/000-001 [Inc.Enc./24V/32Bit/Diff.]....................................23
2.1.3.1 View..............................................................................................23
2.1.3.2 Description.................................................................................... 23
2.1.3.3 Display Elements ..........................................................................25
2.1.3.4 Schematic Diagram....................................................................... 25
2.1.3.5 Technical Data .............................................................................. 26
2.1.3.6 Functional Description..................................................................28
2.1.3.7 Process Image ...............................................................................29
2.1.4 750-637/000-002 [Inc.Enc./24V/32Bit/S.E.].....................................33
2.1.4.1 View..............................................................................................33
2.1.4.2 Description.................................................................................... 33
2.1.4.3 Display Elements ..........................................................................35
2.1.4.4 Schematic Diagram....................................................................... 35
2.1.4.5 Technical Data .............................................................................. 36
2.1.4.6 Functional Description..................................................................38
2.1.4.7 Process Image ...............................................................................39
2.1.5 750-637/000-004 [Inc.Enc./24V/32Bit/S.E./cam].............................43
2.1.5.1 View..............................................................................................43
2.1.5.2 Description.................................................................................... 43
2.1.5.3 Display Elements ..........................................................................45
2.1.5.4 Schematic Diagram....................................................................... 45

iv •Contents
WAGO-I/O-SYSTEM 750
I/O Modules
2.1.5.5 Technical Data ..............................................................................46
2.1.5.6 Functional Description..................................................................47
2.1.5.7 Process Image ...............................................................................49
3Use in Hazardous Environments .............................................................54
3.1 Identification ..........................................................................................55
3.1.1 For Europe according to CENELEC and IEC ...................................55
3.1.2 For America according to NEC 500 ..................................................58
3.2 Installation Regulations..........................................................................59
3.2.1 Special Conditions for Safe Operation of the ATEX and IEC Ex (acc.
DEMKO 08 ATEX 142851X and IECEx PTB 07.0064)..................60
3.2.2 Special conditions for safe use (ATEX Certificate TÜV 07 ATEX
554086 X) ..........................................................................................61
3.2.3 Special conditions for safe use (IEC-Ex Certificate TUN 09.0001 X)62
3.2.4 ANSI/ISA 12.12.01 ........................................................................... 63

Important Notes •5
Legal Bases
WAGO-I/O-SYSTEM 750
I/O Modules
1 Important Notes
This section includes an overall summary of the most important safety
requirements and notes that are mentioned in each individual section. To
protect your health and prevent damage to devices as well, it is imperative to
read and carefully follow the safety guidelines.
1.1 Legal Bases
1.1.1 Copyright
This Manual, including all figures and illustrations, is copyright-protected.
Any further use of this Manual by third parties that violate pertinent copyright
provisions is prohibited. Reproduction, translation, electronic and
phototechnical filing/archiving (e.g., photocopying) as well as any
amendments require the written consent of WAGO Kontakttechnik GmbH &
Co. KG, Minden, Germany. Non-observance will involve the right to assert
damage claims.
WAGO Kontakttechnik GmbH & Co. KG reserves the right to provide for any
alterations or modifications that serve to increase the efficiency of technical
progress. WAGO Kontakttechnik GmbH & Co. KG owns all rights arising
from the granting of patents or from the legal protection of utility patents.
Third-party products are always mentioned without any reference to patent
rights. Thus, the existence of such rights cannot be excluded.
1.1.2 Personnel Qualifications
The use of the product described in this Manual requires special personnel
qualifications, as shown in the following table:
Activity Electrical specialist Instructed
personnel*)
Specialists**) having
qualifications in PLC
programming
Assembly X X
Commissioning X X
Programming X
Maintenance X X
Troubleshooting X
Disassembly X X
*) Instructed persons have been trained by qualified personnel or electrical specialists.
**) A specialist is a person, who – thanks to technical training – has the qualification, know-
ledge and expertise to meet the required specifications of this work and to identify any po-
tential hazardous situation in the above listed fields of activity.

6 • Important Notes
Legal Bases
WAGO-I/O-SYSTEM 750
I/O Modules
All responsible persons have to familiarize themselves with the underlying
legal standards to be applied. WAGO Kontakttechnik GmbH & Co. KG does
not assume any liability whatsoever resulting from improper handling and
damage incurred to both WAGO´s own and third-party products by
disregarding detailed information in this Manual.
1.1.3 Use of the 750 Series in Compliance with Underlying
Provisions
Couplers, controllers and I/O modules found in the modular WAGO-I/O-
SYSTEM 750 receive digital and analog signals from sensors and transmit
them to the actuators or higher-level control systems. Using programmable
controllers, the signals can also be (pre-)processed.
The components have been developed for use in an environment that meets
the IP20 protection class criteria. Protection against finger injury and solid
impurities up to 12.5 mm diameter is assured; protection against water damage
is not ensured. Unless otherwise specified, operation of the components in wet
and dusty environments is prohibited.
1.1.4 Technical Condition of Specified Devices
The components to be supplied Ex Works, are equipped with hardware and
software configurations, which meet the individual application requirements.
Changes in hardware, software and firmware are permitted exclusively within
the framework of the various alternatives that are documented in the specific
manuals. WAGO Kontakttechnik GmbH & Co. KG will be exempted from
any liability in case of changes in hardware or software as well as to non-
compliant usage of components.
Please send your request for modified and new hardware or software
configurations directly to WAGO Kontakttechnik GmbH & Co. KG.

Important Notes •7
Standards and Guidelines for Operating the 750 Series
WAGO-I/O-SYSTEM 750
I/O Modules
1.2 Standards and Guidelines for Operating the 750 Series
Please adhere to the standards and guidelines required for the use of your
system:
The data and power lines shall be connected and installed in compliance
with the standards required to avoid failures on your system and to
substantially minimize any imminently hazardous situations resulting in
personal injury.
For assembly, start-up, maintenance and troubleshooting, adhere to the
specific accident prevention provisions which apply to your system (e.g.
BGV A 3, "Electrical Installations and Equipment").
Emergency stop functions and equipment shall not be made ineffective.
See relevant standards (e.g. DIN EN 418).
The equipment of your system shall be conform to EMC guidelines so that
any electromagnetic interferences will be eliminated.
Operating 750 Series components in home applications without further
measures is permitted only if they meet the emission limits (emissions of
interference) in compliance with EN 61000-6-3. You will find the detailed
information in section "WAGO-I/O-SYSTEM 750" "System
Description" "Technical Data".
Please observe the safety precautions against electrostatic discharge in
accordance with DIN EN 61340-5-1/-3. When handling the modules,
please ensure that environmental factors (persons, working place and
packaging) are well grounded.
The valid standards and guidelines applicable for the installation of switch
cabinets shall be adhered to.

8 • Important Notes
Symbols
WAGO-I/O-SYSTEM 750
I/O Modules
1.3 Symbols
Danger
Always observe this information to protect persons from injury.
Warning
Always observe this information to prevent damage to the device.
Attention
Marginal conditions that must always be observed to ensure smooth and
efficient operation.
ESD (Electrostatic Discharge)
Warning of damage to the components through electrostatic discharge.
Observe the precautionary measure for handling components at risk of
electrostatic discharge.
Note
Make important notes that are to be complied with so that a trouble-free and
efficient device operation can be guaranteed.
Additional Information
References to additional literature, manuals, data sheets and internet pages.

Important Notes •9
Safety Information
WAGO-I/O-SYSTEM 750
I/O Modules
1.4 Safety Information
When connecting the device to your installation and during operation, the
following safety notes must be observed:
Danger
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 is only permitted via a key or tool to authorized qualified personnel.
Danger
All power sources to the device must always be switched off before carrying
out any installation, repair or maintenance work.
Warning
Replace defective or damaged device/module (e.g. in the event of deformed
contacts), as the functionality of field bus station in question can no longer be
ensured on a long-term basis.
Warning
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 the
components must be installed in an enclosure that is resistant against the
above mentioned materials. Clean tools and materials are generally required
to operate the device/module.
Warning
Soiled contacts must be cleaned using oil-free compressed air or with ethyl
alcohol and leather cloths.
Warning
Do not use contact sprays, which could possibly impair the functioning of the
contact area.
Warning
Avoid reverse polarity of data and power lines, as this may damage the
devices.
ESD (Electrostatic Discharge)
The devices are equipped with electronic components that may be destroyed
by electrostatic discharge when touched.

10 • Important Notes
Font Conventions
WAGO-I/O-SYSTEM 750
I/O Modules
Warning
For components with ETHERNET/RJ-45 connectors:
Only for use in LAN, not for connection to telecommunication circuits.
1.5 Font Conventions
italic Names of paths and data files are marked in italic-type.
e.g.: C:\Programs\WAGO-IO-CHECK
italic Menu items are marked in italic-type, bold letters.
e.g.: Save
\ A backslash between two names characterizes the selection of a
menu point from a menu.
e.g.: File \ New
END Pushbuttons are marked as bold with small capitals
e.g.: ENTER
< > Keys are marked bold within angle brackets
e.g.: <F5>
Courier The print font for program codes is Courier.
e.g.: END_VAR
1.6 Number Notation
Number code Example Note
Decimal 100 Normal notation
Hexadecimal 0x64 C notation
Binary '100'
'0110.0100'
In quotation marks,
nibble separated with dots (.)
1.7 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) •11
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
750-637/
000-004
Function Incremental
Encoder
Interface
Incremental
Encoder
Interface
Incremental
Encoder
Interface
Incremental
Encoder
Interface
Incremental
Encoder
Interface
Input differential differential single
ended
differential differential
Sensor Operation
Voltage
DC 5 V DC 24 V DC 24 V DC 5 V DC 5 V
Interpretation fourfold fourfold fourfold single single
Bit Width 32 Bit 32 Bit 32 Bit 32 Bit 32 Bit

12 • 750-637 [Inc.Enc./RS422/32Bit/Diff.]
Variations
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 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
2.1.2.2 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
2.1.2.3 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.] •13
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.

14 • 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 A
green U(A) - U(/A) > 0,2 V
or both inputs open
off U(C) - U(/C) < -0,2 V
B1 C
green U(C) - U(/C) > 0,2 V
or both inputs open
off U(B) - U(/B) < -0,2 V
C1 B
green U(B) - U(/B) > 0,2 V
or both inputs open
off Input = 0 V or open
D1 Latch
green Input = 24 V
off Input = 0 V or open
A2 Gate
green Input = 24 V
off Output = 0 V
B2 N1
green Output = 24 V
off Input = 0 V or open
C2 Ref
green 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 N2
green 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.] •15
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 m
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

16 • 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)
Conformity Marking
CULUS (UL508)
The following Ex approvals have been granted to the basic version of 750-637
I/O modules:
TÜV (07 ATEX 554086 X)
I M2 Ex d I
II 3 G Ex nA IIC T4
II 3 D Ex tD A22 IP6X
T135°C
Permissible operation temperature: 0 °C ≤TA ≤+60 °C
TÜV (TUN 09.0001X)
Ex d I
Ex nA IIC T4
Ex tD A22 IP6X T135°C
Permissible operation temperature: 0 °C ≤TA ≤+60 °C
CULUS (ANSI/ISA 12.12.01) Class I Div2 ABCD T4
UCIEE BR-Ex nA II T4
The following Ex approvals have been granted to the variation 750-637/000-
003:
DEMKO (08 ATEX 142851X) I M2/ II 3 GD Ex nA IIC T4
CULUS (ANSI/ISA 12.12.01) Class I Div2 ABCD T4
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: http://www.wago.com Service Downloads Documentation 
WAGO-I/O-SYSTEM 750 System Description.

750-637 [Inc.Enc./RS422/32Bit/Diff.] •17
Technical Data
WAGO-I/O-SYSTEM 750
I/O Modules
Further „General Technical Data“ for the WAGO-I/O-SYSTEM 750 is
available in the specific fieldbus coupler / controller manuals.

18 • 750-637 [Inc.Enc./RS422/32Bit/Diff.]
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

750-637 [Inc.Enc./RS422/32Bit/Diff.] •19
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

20 • 750-637 [Inc.Enc./RS422/32Bit/Diff.]
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