OPC UA Connection to S7-1500 PLC Keeps Faulting

Ignition
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1

I am getting the below error on my S7-1500 PLC OPC UA Server. Another thing of note is that the vision application and tag updates seem to be more sluggish than I'm familiar with.

java.lang.Exception: session inactive: id=NodeId{ns=1, id=1326793202} name=ignition[Ignition-5044]_SIMATIC.S7-1500.OPC-UA.Application:5044PLCA_1747849305404
at com.inductiveautomation.ignition.gateway.opcua.client.connection.OpcUaConnection$MiloSessionActivityListener.onSessionInactive(OpcUaConnection.kt:499)
at org.eclipse.milo.opcua.sdk.client.session.SessionFsmFactory.lambda$null$39(SessionFsmFactory.java:611)
at java.base/java.util.concurrent.CopyOnWriteArrayList.forEach(Unknown Source)
at org.eclipse.milo.opcua.sdk.client.session.SessionFsmFactory.lambda$configureActiveState$40(SessionFsmFactory.java:611)
at com.digitalpetri.strictmachine.dsl.ActionBuilder$PredicatedTransitionAction.execute(ActionBuilder.java:119)
at com.digitalpetri.strictmachine.StrictMachine$PollAndEvaluate.lambda$run$0(StrictMachine.java:242)
at java.base/java.util.ArrayList.forEach(Unknown Source)
at com.digitalpetri.strictmachine.StrictMachine$PollAndEvaluate.run(StrictMachine.java:227)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.base/java.lang.Thread.run(Unknown Source)

8.1.39 (b2024040909)
Azul Systems, Inc. 17.0.10

2

There may be some additional information in the logs. This stack trace you end up with on the status page isn't particularly useful - it's telling us we lost our session but not why we lost it.

3

Well, that's helpful. (sarcasm)

Thanks for responding, though. What area of the gateway would I find the logs related to this issue? (might be a dumb question once I know the answer)

4

In the rest of the logs on the logs page, hopefully.

This is probably something basic like the keep alive check between the client/server failing or somebody downloading to the PLC, which causes all Clients to lose connection and reconnect.

5

Yeah, I am very familiar with the OPC UA server dropping when I download to the PLC in TIA Portal. It normally doesn't seem to coincide with me doing that, but it could be that. I'll have to see if it's stable over the next few days, as I won't be making any PLC changes during that time. Thanks for helping me out, though; it's much appreciated.