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Question: OPC UA Client Communication Error
I am facing a communication issue while using the OPC UA Client driver in WinCC OA version 3.20. Below are the steps I followed and the issue I am encountering.
Steps Performed
I created an OPC UA Client Manager, assigned it driver number 3, and started it successfully.
From System Management → OPC Drivers → OPC UA Client, I created the OPC UA driver with:
Security: None
Authentication: Anonymous
The URL of an installed OPC UA simulator
Using the command line, I browsed to the device created in the OPC UA simulator. The server status shows connected and running.
From PARA, I navigated to my desired master template and added PowerConfiguration, configuring the address type as OPC UA Periphery Address.
From the DPE Address Configuration, I am able to browse and navigate to the created datapoint on the OPC UA server. However:
The Verify and OK buttons remain disabled
The address cannot be applied or saved
Error Messages
The following errors are generated in the log when attempting to browse or verify the address: "SEVERE, 42/opcua, OpcUaCComm in Function browse, Error while browsing from Node ns=2;s=Channel1.Device3 @ opc.tcp://WIN-KLOK7HD8636:49320 (Statuscode: BadNotSupported)
WCCOAopcua (3), 2026.05.03 08:25:56.588, SYS, SEVERE, 40/opcua, OpcUaCBrowse in Function browseToRoot, Can not browse from start node Channel1.Device3 @ OPC_UA_Client"
Responses (1)
From the description I cannot see if you tried to configure the address on the master datapoint or an instance of it.
When using master datapoints and working on the instances it is the correct behaviour that the "OK" button is greyed out in this panel.
Modifiying attributes of power configs is only possible by doing a right click on the DP element and choosing the option to configure the power configs.
Best Regards
Leopold Knipp
Senior Support Specialist