2020/04/07
WCC Lite user manual
Figure 28: Upload and download of 4Diac configuration files
After the file has been imported one should be able to download it from the same screen as seen in
Figure 28.
Uploading file saves its name and shows it in web interface. It is advised to
carefully choose filename to separate different versions of PLC application files.
18.1.6 Distributed control application
IEC 64199 standard introduced requirements for a distributed control. This means that multiple
devices can change information between them and make their own decisions based on the data
they receive from other sources. This enables distributed applications between multiple WCC Lite
devices and all other devices that support IEC 61499.
Communication between devices can be configured using:
• Publish/Subscribe function blocks (via UDP packets);
• Client/Server function blocks (via TCP packets).
A Publish block can publish data messages using UDP multicast addresses meaning that multiple
devices would be able to simultaneously get the same data. However, one would have to make sure
that all of the devices support multicast option.
This user manual will only cover setting up pointtopoint communication between devices via
Publish/Subscribe blocks. For more information on communication between several IEC 61499
devices please check documentation for
Eclipse 4diac framework
.
Let’s say we would like to count how many times the light has been turned on. For this we can add
counting functionality to application shown in Figure 19. The application should run on 2 devices.
The blinking part of the application will run on a 4diac FORTE and the count on another 4diac FORTE,
see the architecture below in Figure 29. The two different programs running on two separate WCC
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1.4.0 | ELSETA | Programmable logic controller
