SystemLink OPC UA Tags Not Updating After OPC UA Server Reconnected

Updated Dec 13, 2023

Reported In


  • SystemLink
  • SystemLink OPC UA Connector

Issue Details

  • I am using the SystemLink OPC UA Connector to read data from my OPC UA server. I have created several monitors for the OPC UA variables which are mapped to my SystemLink tags. When the network connection is disrupted between SystemLink and my OPC UA server, my OPC UA tags stop updating even after the OPC UA server is reconnected. The tags maintain the last value before the system was disconnected and never updated.
  • One of SystemLink Servers hosting production Apps, lost the OPC connector configuration. After server restart, problem was not resolved.


This is a known issue with the SystemLink OPC UA Connector. Bug 950454 has been filed for this issue.

To get the tags to start updating again, you can try the following workaround:
  1. In SystemLink, open the OPC UA Connector.
  2. Double-click on your OPC UA server.
  3. Select the monitored items from the Monitor window and then click Delete Monitor.
  4. In the dialog box, leave Delete the tag associated with the selected monitored item unchecked and click Delete.

  1. Recreate the monitored items that you just deleted.
If the above steps were followed as instructed, the tags should begin to update again.