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3-Newcomer
July 30, 2026
Question

Bad quality tags using OPC UA Client Driver

  • July 30, 2026
  • 0 replies
  • 2 views

I have a OPC UA server (on a siemens comfort panel) that I want to read in some tags on my Kepware Server 7.1.271.0 server. I’ve set up an OPC UA channel and device, and I’m able to perform automatic tag generation tasks (I’m able to see the tags I have configured over there). The problem is that when I then try to read Kepware’s tags from this, the tag quality is bad. Maybe about once a minute I get a message in the log that the OPC UA Client driver is reconnecting due to connection loss- which sometimes, but not always corresponds to one momentary instance when the tag quality goes good and I’m able to read in the tags.

 

The authentication is not using any security policy or message mode.

 

I’m a bit flummoxed because I’m able to set up an Unified Automation OPC UA client that can read from the client just fine on the same machine as the Kepware server with the same settings. I did some debugging with Wireshark and saw that OPC traffic from that client to the panel was normal, while the traffic coming from Kepware to the panel would have its TCP connection establish procedure get cut off by RST packet from the panel. So I think the panel is unhappy about something from Kepware but not the UA client.

 

I did check the certs on the panel and nothing in the rejected folder.

 

Any help would be appreciated!