WAGO-I/O-SYSTEM 750
Application Examples 367
750-880, 750-880/025-000 ETHERNET Programmable Fieldbus Controller
Manual
Version 1.0.1
The use of SCADA systems includes the areas of visualization and monitoring,
data access, trend recording, event and alarm processing, process analysis and
targeted intervention in a process (control).
The WAGO ETHERNET fieldbus node provides the required process input and
output values.
Note
SCADA software has to provide a MODBUS device driver and support
MODBUS/TCP functions!
When choosing suitable SCADA software, ensure that it provides a MODBUS
device driver and supports the MODBUS/TCP functions in the coupler.
Visualization programs with MODBUS device drivers are available from i.e.
Wonderware, National Instruments, Think&Do or KEPware Inc., some of which
are available on the Internet as demo versions.
The operation of these programs is very specific.
However, a few essential steps are described to illustrate the way an application
can be developed using a WAGO ETHERNET fieldbus node and SCADA
software in principle:
1.
Load the MODBUS ETHERNET driver and select MODBUS ETHERNET
2.
Enter the IP address for addressing the fieldbus node
At this point, some programs allow the user to give the node an alias name, i.e. to
call the node "Measuring data". The node can then be addressed with this name.
3.
Create a graphic object, such as a switch (digital) or a potentiometer
(analog)
This object is displayed on the work area.
4.
Link the object to the desired data point on the node by entering the
following data:
•
Node address (IP address or alias name)
•
The desired MODBUS function codes (register/bit read/write)
•
The MODBUS address of the selected channel
Entry is program specific.
Depending on the user software the MODBUS addressing of a bus module can be
represented with up to 5 digits.
