WAGO 750 Series User manual

Fieldbus Independent
I/O Modules
2-Channel Up/Down Counter / 500
Hz
750-638(/xxx-xxx)
Manual
Version 1.0.3

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 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 gener-
ally 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 Counter Modules....................................................................................7
2.1.1 750-638(/xxx-xxx) [2-Channel Up/Down Counter / 500 Hz]..........7
2.1.1.1 Variations................................................................................... 7
2.1.1.2 View...........................................................................................7
2.1.1.3 Description................................................................................. 8
2.1.1.4 Display elements........................................................................9
2.1.1.5 Schematic Diagram..................................................................10
2.1.1.6 Technical Data .........................................................................11
2.1.1.7 Process Image ..........................................................................12
2.1.1.8 Data Transfer ...........................................................................13
2.1.1.9 Example: Set counter 1 on value 100 and count forward........14

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 inverted commas,
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 Digital Input Module 750-638(/xxx-xxx)
2-Channel Up/Down Counter / 500 Hz 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.

750-638(/xxx-xxx) [2-Channel Up/Down Counter / 500 Hz]• 7
Variations
WAGO-I/O-SYSTEM 750
I/O Modules
2 I/O Modules
2.1 Counter Modules
2.1.1 750-638(/xxx-xxx) [2-Channel Up/Down Counter / 500 Hz]
2-Channel Up/Down Counter DC 24 V, 16 Bit, 500 Hz
2.1.1.1 Variations
Item-No. Designation Description
750-638 2-Channel Up/Down
Counter / 500 Hz
2-Channel Up/Down Counter DC 24 V,
500 Hz
750-638/025-000 2-Channel Up/Down
Counter / 500 Hz/T
2-Channel Up/Down Counter DC 24 V,
500 Hz
extended temperature range from –20 °C to
+60 °C
2.1.1.2 View
13
15
14
16
++
--
13 14
C
D
B
A
750-638
+DI 2
Power jumper contacts
Data contacts
Function
24V
0V
-DI 2
Function
+DI 1
DI 2
DI 1
-DI 1
Counting
positive
impulses
Counting
negative
impulses
Potential
free
signal
Fig. 2.1.1-1: 2-Channel Up/Down Counter 750-638 g063800e

8 • 750-638(/xxx-xxx) [2-Channel Up/Down Counter / 500 Hz]
Description
WAGO-I/O-SYSTEM 750
I/O Modules
2.1.1.3 Description
The 2-channel counter module 750-638 counts 24 V DC binary pulses from
digital field devices (sensors, switches, etc.) forward and backwards.
This I/O module has two independent 16 bit up/down counters. One field de-
vice per channel can be directly connected independent of the wiring.
The counters are only equipped with terminals on the field side. Since both
counters are potential free, the external 24 V pulse signals can be directly con-
nected to –DI 1 and +DI 1 or -DI 2 and +DI 2.
By using the ground potential of the module, each counter can count either po-
sitive or negative pulses independent of the external module wiring.
By connecting, for example, two 2-conductor field devices, one to the upper
signal input +DI 1 or +DI 2 and the other to the 24 V connection, as well as
connecting the 0 V signal and the corresponding lower signal –DI 1 or –DI 2
in a bridged mode, positive voltage pulses can be identified and counted via
the 24 V signals sent to + DI 1 or +DI 2.
By connecting, for example, two 2-conductor field devices, one to the lower
signal input -DI 1 or -DI 2 and the other to the 0 V connection, as well as con-
necting the 24 V signal and the corresponding upper signal +DI 1 or +DI 2 in
a bridged mode, negative voltage pulses can be identified and counted via the
0 V signals sent to -DI 1 or -DI 2.
Channel-wise mixed wiring of the counters is possible (counting with poten-
tial free signal, with positive and negative pulse).
Each I/O module delivers 3 bytes per channel.
Two of them are delivered by the count data, which is transmitted to the con-
trol system as a 16-bit value via the fieldbus. The third byte is a control/status
byte, which is used for the bidirectional data exchange of the bus module with
the upper level control system.
The control byte is transmitted from the control system to the I/O module and
the status byte from the I/O module to the control system.
The control bytes are used to set, reset and lock the counters. Defining the
counting direction of the counters (incrementing or decrementing the count) is
also possible via setting within the control byte.
The content of the control byte is acknowledged by the status byte after the
preset counter function has been processed.
An individual green status LED indicates the presence of a counting pulse at
the channels. Communication with the coupler/controller is indicated by an
additional green function LED.
Field and system levels are electrically isolated.

750-638(/xxx-xxx) [2-Channel Up/Down Counter / 500 Hz]• 9
Display elements
WAGO-I/O-SYSTEM 750
I/O Modules
The individual I/O modules can be arranged freely when designing the field-
bus node. A block-wise arrangement of the modules is not required.
The 24 V voltage supplying the field level and the 0 V potential is provided to
the up/down counter module either using a preconnected I/O module or a sup-
ply module. Power connections are made automatically from module to mod-
ule via the internal power contacts when the input modules are snapped onto
the DIN rail.
Warning
The maximum current of the internal power jumper contacts is 10 A. When
configuring the system it is important not to exceed the maximum/sum cur-
rent. However, if such a case should occur, another supply module must be
added.
The up/down counter module can be operated with all couplers/controllers of
the WAGO-I/O-SYSTEM 750 (except for the digital only versions 750-320,
750-323, 750-324 and 750-327).
2.1.1.4 Display elements
LED Channel Designation State Function
off Counter 1: no communication with
coupler/controller
A
green
Function
DI 1 on Counter 1: communication with
coupler/controller
off Counter 1: signal input off
B
green
1
Status
DI 1 on Counter 1: DC 24 V signal input on
off Counter 2: no communication with
coupler/controller
C
green
Function
DI 2 on Counter 2: communication with
coupler/controller
off Counter 2: signal input off
13 14
C
D
B
A
D
C
B
A
Abb. 2.1.1-2: Display
elements g063802x
D
green
2
Status
DI 2 on Counter 2: DC 24 V signal input on

10 •750-638(/xxx-xxx) [2-Channel Up/Down Counter / 500 Hz]
Schematic Diagram
WAGO-I/O-SYSTEM 750
I/O Modules
2.1.1.5 Schematic Diagram
+DI 1
-DI 1 -DI 2
+DI 2
24V
0V
+DI
-DI
0V
270pF
270pF
10nF
DI
Function
Logic
24V
1
2
3
4
5
6
7
8
750-638
Fig. 2.1.1-3: 2-Channel Up/Down Counter 750-638 g063801e