WAGO I/O SYSTEM 750 750-635 User manual

Fieldbus Independent
I/O Modules
Digital Impulse Interface
750-635
Manual
Version 1.1.3

ii • General
WAGO-I/O-SYSTEM 750
I/O Modules
Copyright 2005 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 ex-
cluded, 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 tra-
demarks of companies used and/or mentioned in the present manual are gene-
rally trademark or patent protected.

Content • iii
WAGO-I/O-SYSTEM 750
I/O Modules
CONTENT
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
2.1.1 750-635 [Digital Impulse Interface] .................................................... 7
2.1.1.1 View................................................................................................ 7
2.1.1.2 Description...................................................................................... 7
2.1.1.3 Schematic Diagram......................................................................... 8
2.1.1.4 Display Elements ............................................................................ 8
2.1.1.5 Technical Data ................................................................................ 9
2.1.1.6 Functional Description.................................................................. 10
2.1.1.7 Process Image ...............................................................................11
2.1.1.8 Application / Start-up.................................................................... 13

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 con-
tained therein. Any use of this manual which infringes the copyright provi-
sions stipulated herein, is not permitted. Reproduction, translation and elec-
tronic and photo-technical archiving and amendments require the written con-
sent 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 modi-
fications 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 special-
ists having qualifications in PLC programming, electrical specialists or per-
sons instructed by electrical specialists who are also familiar with the valid
standards. WAGO Kontakttechnik GmbH & Co. KG declines all liability re-
sulting 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 per-
mitted 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 Kon-
takttechnik 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 insu-
lating properties. Belonging to this group of materials is: e.g. aerosols, sili-
cones, triglycerides (found in some hand creams).
If it cannot be ruled out that these materials appear in the component envi-
ronment, 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 envi-
ronment (persons, workplace and packing) is well grounded. Avoid touching
conductive components, e.g. gold contacts.
1.5 Scope
This manual describes the Special Module 750-635 Digital Impulse Interface
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.

750-635 [Digital Impulse Interface] • 7
View
WAGO-I/O-SYSTEM 750
I/O Modules
2 I/O Modules
2.1 Special Modules
2.1.1 750-635 [Digital Impulse Interface]
1 Channel Digital Impulse Interface for Magneto-strictive Distance Sensors
2.1.1.1 View
II
++
SS
13 14
C
D
B
A
750-635
_
_
I
Power jumper contacts
Data contacts
24V
0V
S
Error
Function
I
S
_
_
--
Fig. 2.1.1-1: 1 Channel Digital Impulse Interface 750-635 g063500e
2.1.1.2 Description
The digital impulse interface is designed for the connection of magneto-
strictive distance sensor. Fast and fail-safe signal transmission is guaranteed
by the RS422 interface.
Once a start pulse has been received, the magneto-strictive sensor will return
the echo(s) of this pulse to the input module via the RS422 interface. In the
sensor, a pulse extends towards the end of the rod which is energized by the
position marker (magnets) and transformed into a stop signal in the sensor e-
lectronics. The time between the start pulse echo and the stop pulse is measu-
red and made available to the controls in a 24 bit value, whereby the measured
time is proportional to the distance.
At the time of start-up of the interface, the waveguide velocity of the distance
sensor in the control program has to be taken into consideration to be able to
parameterize the digital impulse interface accordingly following a voltage fai-
lure. The controls can perform an adjustment of the zero point and of the num-
ber of position markers.

8 • 750-635 [Digital Impulse Interface]
Schematic Diagram
WAGO-I/O-SYSTEM 750
I/O Modules
Attention
This module has no power contacts for ground (earth). For field supply with
ground (earth) to downstream I/O modules, a supply module will be needed.
The module 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).
2.1.1.3 Schematic Diagram
I
I
S
S
_
_
_
_
I
24V
0V
S
I
Function
24V
0V
Logic
Error
S
2 x 10nF
1 x 10nF
2 x 270pF
2 x 270pF
1
2
3
4
5
6
7
8
750-635
Fig. 2.1.1-2: 1 Channel Digital Impulse Interface 750-635 g063501e
2.1.1.4 Display Elements
LED Designa-
tion
Status Function
off Module is not taking part in data exchange
A
green
Function
on Module is taking part in data exchange
off Faultless operation
13 14
C
D
B
A
A
B
Fig. 2.1.1-3: Dis-
play Elements
g063802x
B
red Error
on
Line break
No acknowledgement from sensor,
waveguide velocity is not set

750-635 [Digital Impulse Interface] • 9
Technical Data
WAGO-I/O-SYSTEM 750
I/O Modules
2.1.1.5 Technical Data
Module Specific Data
Sensor connection Start/Stop; Init; Uv; Ground
Connection of the shield via the housing of the
sensor
Number of inputs 1
Current consumption (internal) 45 mA
Voltage via power jumper contacts DC 24 V (-15 % ... + 20 %)
Data transmission RS 422
Signal output Differential signal RS 422
Signal input Differential signal RS 422
Internal bit width 1 x 24 bits Data In/Out
1 x 8 bits Control/Status In/Out
Resolution 1 µm
Hysteresis, Precision depends on the distance sensor
Update time 2 ms
Distance sensor length ≤4 m
Maximum line length.500 m
Isolation 500 V (System/Supply)
Dimensions (mm) W x H x L 12 x 64* x 100
* from upper edge of 35 DIN rail
Weight ca. 55 g
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 !Documentation !WAGO-I/O-SYSTEM 750 !Sys-
tem Description

10 • 750-635 [Digital Impulse Interface]
Functional Description
WAGO-I/O-SYSTEM 750
I/O Modules
Further general technical data for the WAGO-I/O-SYSTEM 750 is available
in the manuals of the specific fieldbus coupler / controller.
2.1.1.6 Functional Description
2.1.1.6.1 Block Diagram of the P-Interface
INIT
START/STOP
750-635 BTL
RS422
Fig. 1: 2.4 Block diagram of the P-Interface
2.1.1.6.2 Block Diagram of the I/O Module
The following block-diagram should clarify the internal function of the I/O
module. Cyclical start-impulses are initiated by the ASIC and, depending on
the number of positioners, the stop-impulses from the sensor are processed.
The sensor-specific velocity of the waveguide is taken into consideration. It is
the task of the µController to trigger the measuring cycle and to poll the meas-
uring data from the multiplexer. The following digital filter decreases the noi-
se and a zero unit enables measuring of relative position values if necessary.
Data-exchange with the PLC is handled via the RAM which contains 3 byte of
data and 1 byte for status and control.
Fig. 2: Block Diagram

750-635 [Digital Impulse Interface] • 11
Process Image
WAGO-I/O-SYSTEM 750
I/O Modules
2.1.1.6.3 Sensor Connection
Input Function
I+ 1 Init-Signal RS422, positive
I- 5 Init-Signal RS422, negative
S+ 4 Start/Stop-Signal RS422, positive
S- 8 Start/Stop-Signal RS422, negative
+24V 2,6 24 V supply voltage for the distance sensor
0V 3,7 Frame potential for the distance sensor
As an alternative to the represented sensor connection, the shielded part of the
cable can be fixed by WAGO’s 790 series shield (screen) clamping saddles.
2.1.1.6.4 Voltage Supply
The bus module gets a voltage supply of 24V (-15% / +20%) via the power
jumper contacts. The distance sensor can be directly supplied with the 24V
voltage of the module. It should be taken into account whether the voltage
supply is restricted by other technical data.
Note
As the precision of the distance sensors depends in certain limits on the sta-
bility of the voltage supply a regulated high-capacity power supply unit
should be used to supply the bus node and the field side or a separation of the
voltage supply between actuators and sensors should be provided.
2.1.1.7 Process Image
This I/O module is represented with 4 bytes in the input process image and al-
so with 4 bytes in the output process image. The transfer of the data to be
transmitted and the received data is made via 3 output and 3 input bytes (D0 ...
D2). 1 Control byte (C) and 1 Status byte (S) are used to control the floating
data.
Input data Output data
S Status byte C Control byte
D0 Process data Byte 0 (LSB) D0 Set value Byte 0 (LSB)
D1 Process data Byte 1 D1 Set value Byte 1
D2 Process data Byte 2 (MSB) D2 Set value Byte 2 (MSB)

12 • 750-635 [Digital Impulse Interface]
Process Image
WAGO-I/O-SYSTEM 750
I/O Modules
2.1.1.7.1 Control Byte
Control byte C
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
0 0 Sensor
A1
Sensor
A0
To set the
zero
point
To set
wave-
guide
velocity
To set the
number
of sen-
sors
Error
Reset
Error Reset In case of 1-signal the stop-underflow/ and –overflow bit and the error bit are
reset (not edge-triggered)
To set the
number of
sensors
In the case of a rising edge the number of sensors set in Bit 4 and 5 are taken
over.
0 reserved
Setting and Selection of Positioners
Because the I/O module allows up to 4 positioners at the sensor, in case of
more than one positioner is being used, it is necessary to:
• set the no. of positioners during initialization of the I/O module
• select a positioner for the measuring cycle
Setting the No. of Positioners (Initialization)
The setting of no. of positioners installed at the sensor has to be processed by
the PLC during initialization via bits 4 and 5 of the control-byte (see table 3
and 4). The adjusted no. of positioners will be stored in the RAM if bit 1 is set
to high.
Selection of a Positioner (Measuring Cycle)
During operation up to 4 different values from the positioners could be calcu-
lated in series. To request a specific positioner, bits 4 and 5 from the control-
byte have to be set.
Triggering of the position transmitters:
Bit 5
A1
Bit 4
A0
Position transmitter
0 0 1
0 1 2
1 0 3
1 1 4
Attention
Bit 1 of the control-byte has to be kept to „0“during normal operation.

750-635 [Digital Impulse Interface] • 13
Application / Start-up
WAGO-I/O-SYSTEM 750
I/O Modules
2.1.1.7.2 Status Byte
Status Byte S
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
0 Error Sensor
A1
Sensor
A0
ACK
(setting
zero
adjust-
ment)
ACK
(setting
wave-
guide
velocity)
- top un-
der-flow
(not
enough
stop
impulses)
Error 0 = faultless operation
1 = group signal error e.g.:
- waveguide velocity not set
- less no. of stop impulses
- maximum waveguide velocity exceeded
- timeout: there are no measured values, measured values not valid
- error occurred when setting waveguide velocity or zero point
- selection of sensor not valid; the selected address is invalid because of
the missing initialization
0 reserved
2.1.1.8 Application / Start-up
2.1.1.8.1 Setting the Waveguide Speed
Each application of this bus module requires a specific setting, knowing that
each distance sensor operates at a different waveguide velocity of the sensor.
This velocity is set by means of the process data communication with the con-
trol byte and the bus module input bytes. The waveguide velocity can be set as
a decimal value in the range of 0.00 to 3000.00 m/s, the resolution amounting
to 0.01 m/s. This setting is stored in the module operating memory as a non
power failure safe value, and must, therefore, be reloaded into the module by
the controls following each voltage failure (by switching off the bus coupler or
disconnecting modules). The default velocity setting is 0.00 m/s. This status is
signaled by the module’s error LED as well as by bit 6 of the status byte.
The velocity is activated by setting the output bytes to the sensor specific va-
lue, followed by the setting of control bit 2. The feedback of a successful
speed setting is ensured by the set bit 2 of the status byte.

14 • 750-635 [Digital Impulse Interface]
Application / Start-up
WAGO-I/O-SYSTEM 750
I/O Modules
Note
Following a supply voltage failure at the bus coupler, ensure by a correspond-
ing initialization of the bus module that the waveguide velocity setting is re-
instated. The red error LED and a “High” signal of status bit 6 signal the
status “waveguide velocity not set”.
2.1.1.8.2 Zero Point Setting
A zero point setting is also possible by means of the process data communica-
tion. The absolute measured value of the distance sensor is adopted into the
zero point register by the rising edge of bit 3 of the control byte. The zero
point setting is stored in the operating memory of the module as a non power
failure safe value. The feedback of a successful speed setting is ensured by the
set bit 3 of the status byte.
Note
As an alternative to the internal zero point storage, the relative measured va-
lue calculation can also be made by a POU in the controls. We strongly rec-
ommend the latter way if a bus coupler initialization is not guaranteed fol-
lowing a supply voltage failure, or if a reference to the zero point setting is
not possible. Please also refer to chapter Fehler! Verweisquelle konnte
nicht gefunden werden.
2.1.1.8.3 Error Acknowledgement
Errors are signaled with the set bit 6 of the status byte and displayed by the er-
ror LED.
An error is acknowledged automatically following the remedy of the error or
by setting bit 0 in the status byte.

750-635 [Digital Impulse Interface] • 15
Application / Start-up
WAGO-I/O-SYSTEM 750
I/O Modules
2.1.1.8.4 How to perform a module initialization
Power
Power On On
Power On values:
Zero pos. = 0.0;USG=0.0
No. of position markers = 1
Statusbit 6 (Error)= 1
Error LED= On
No.
Of positioners
=>1 ?
velocity setting Terminal
Terminal intialization intialization
via PLC
via PLC
Set no. of
position markers
Reference drive
for position markers 1-4
set zero position
Calculation of
rel. zero in the
terminal ?
Statusbit 6 (Error)
„high“ ?
Acknowledge
with Controlbit 0
Measurement is active
Yes
Yes
Yes
No
No
No
2.1.1.8.5 Examples
2.1.1.8.5.1 Example for the parameterization of a distance sensor with
start/stop interface and 1 position transmitter
Status byte Control byte Output values Input values Remark
hex dec hex dec hex (D2 D1 D0) dec hex (D2 D1 D0) dec
0x40 64 0x00 0 don’t care don’t care 0x00 00 00 0 Switching on coupler/internal
bus
Error: speed is not set
0x04 4 0x04 4 0x04 51 78 283000 Process data 1 Process
data 1
Setting waveguide velocity
(corresponds to 2,830.00 m/s)
0x00 0 0x00 0 don’t care don’t care Process data 1 Process
data 1
Position transmitter 1

16 • 750-635 [Digital Impulse Interface]
Application / Start-up
WAGO-I/O-SYSTEM 750
I/O Modules
2.1.1.8.5.2 Example for the parameterization of a distance sensor with
start/stop interface and 2 position transmitters
Status byte Control byte Output values Input values Remark
hex dec hex dec hex (D2 D1 D0) dec hex (D2 D1 D0) dec
0x40 64 0x00 0 don’t care don’t care 0x00 00 00 0 Switching on coupler/internal
bus
Error: speed is not set
0x04 4 0x04 4 0x04 51 78 283000 Process data 1 Process
data 1
Setting waveguide velocity
(corresponds to 2,830.00 m/s)
0x00 0 0x12 18 don’t care don’t care Process data 1 Process
data 1
Setting the number of sensors
(2 sensors)
0x00 0 0x00 0 don’t care don’t care Process data 1 Process
data 1
Selecting sensor 1 - position
transmitter 1 in process data
0x10 16 0x10 16 don’t care don’t care Process data 2 Process
data 2
Selecting sensor 2 - position
transmitter 2 in process data

750-635 [Digital Impulse Interface] • 17
Notes
WAGO-I/O-SYSTEM 750
I/O Modules

WAGO Kontakttechnik GmbH & Co. KG
Postfach 2880 • D-32385 Minden
Hansastraße 27 • D-32423 Minden
Phone: [phone] – 0
Fax: [phone] – 1 69
E-Mail: [email protected]
Internet: http://www.wago.com