UA_MonitoredItemAddList function block error code 2952790020 after migrating from AS 4.12 to AS 6.5

[Phong_Vo]

Hello,

After using the help files to migrate my AsOpcUac library from AS 4.12 to AS 6.0, I was able to transfer the application to the target. However, the UA_MonitoredItemAddList function block gives me an error code 2952790020 for invalid variable names. The variable names did not changed and they are working for AS 4.12. I double check the required syntax for the variable and my syntax is correct. I am not sure what else could cause this error. This application is downloaded to a OPC client target and it looks like the issue is coming from the client. I used UAExpert to check the OPC UA server side and it is working correctly.

I enable the OPC UA client/server but I did not enable the variables on the client side. I did not have to in AS 4.12. Do I need to do it in AS 6.5?

[pavel.vavra]

Hello,

Are those variables local or global? Local variables are specified without a task name in the AS6 OpcUa_Sample.

Are those variables used in the code? Couldn’t it be somehow connected to this post?

[simon.buschor (Simon B)]

Hello,

Starting from AR6, specifying the NodeQualityID is mandatory. If it is not provided, the error UA_Bad_VariableNameInvalid occurs.

[tomas.miculka (Tomáš Mičulka)]

Hello @Phong_Vo,
Maybe this will help you:

How to implement batch OPC UA subscriptions in AS6

Background — Why the Change Was Made If you are migrating a project from Automation Studio 4 to AS6 and you use OPC UA subscriptions, you will immediately hit a build error that stops the entire compilation: 'UA_MonitoredItemAdd' is not defined 'UA_MonitoredItemRemove' is not defined 'UA_GetNamespaceIndex' is not defined This is not a bug in your code — B&R intentionally removed these function blocks when AS6 introduced the updated AsOpcUac library, which is now based on the OPC 30001 PLC clie…

[Phong_Vo]

Specifying the NodeQualityID solved my problem. Thank you.