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Prosys OPCUA Server does not trigger OnDataChange event
December 24, 2019
15:27, EET
Vishwanath H
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Forum Posts: 1
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December 24, 2019
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I’m currently working with Prosys OPCUA server and I’ve written a client using C# .Net. The client worked well with the previous version of ProSys OPC-UA server and I was able to fetch all values from nodes.

However, I recently installed a newer version 4.0.2-108 on windows and tested. I’m able to observe that the OnDataChange event gets triggered only once with value 0 for all nodes after subscription and OnDataChange does not get triggered later.

Further, I checked that the values in the simulator are changing. eg. counters, random, square which I used as nodeid.

Please let me know if there is a problem in the simulator or if there is something that I have missed.

January 2, 2020
15:23, EET
Markus Johansson

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August 6, 2019
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This sounds strange, the simulations should work normally. Have you tried another client such as our free OPC UA Browser (https://www.prosysopc.com/products/opc-ua-browser/) to confirm that the subscriptions are working? Also you should make sure that the MonitoringMode for MonitoredItems is set to Reporting and that the Data Change Trigger includes the Value.

February 5, 2020
16:16, EET
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February 5, 2020
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Unfortunately, I have the same problem.
My client only updates the default signals. Self-created signals are not updated.

Is it possible to download an older version for testing somewhere?

Thanks a lot in advance!

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