OPC UA client cannot connect to PLC

[Neil.Pate]

Hi there,

Has anybody used the OPC UA client that is part of the DSC toolkit? I am trying to use it to connect to a PLC and am getting error -336653 "The status of the OPC UA server is uncertain"

I am able to create a local OPC UA server in LabVIEW and connect to this with no issues from the LabVIEW OPC UA client, and can connect to the PLC just fine using a different client.

After speaking with NI it looks like this may be a permission issue, but I have tried all the obvious things in the OPC UA client (like client and server certificates), with the same result.

Any tips?

[Johann78]

Hi,

we've developed an OPC DA 3.0 client in Labview and we had similar problems.

Then we added "ole.AuthnLevel=1" in the LabVIEW,ini file (and in the built exe application) and it worked.

Maybe this also helps you ...

Best regards

Hans

[luca_adt]

Hello

Have you resolved the Problem with the ole...? 

[Neil.Pate]

It was fixed for me by using an updated version of the OPC UA client DLL which NI provided. This was back in 2015 so I presume the fix has been rolled into the most recent version.