Error 42 LabVIEW DataSocket Open VI Connection to Non-NI OPC Server

Updated Dec 18, 2023

Reported In

Software

LabVIEW

Other

non-NI OPC Server
LabVIEW DataSockets

Issue Details

I am trying to connect to a non-NI OPC Server using the DataSocket Open VI, but I get Error 42 every time. I know the OPC Server is functional as I am able to access it with a test client that came with the server. When I have NI OPC Quick Client open and connected to the 3rd party OPC Server, DataSocket Open.vi goes through successfully and there are no errors thrown.

Solution

The DataSocket Open VI can connect only if the third-party OPC Server matches the specification exactly as DataSocket is expecting it. Otherwise, LabVIEW DataSocket will not be able to find the published tags.

Try the following troubleshooting step and alternative methods of connecting to your 3rd party OPC Server:

Make sure you have the correct OPC tag URL.
Use DataSocket Select URL VI in place of DataSocket Open VI .
Use OPC Client I/O Servers in your LabVIEW project in place of DataSockets. This requires the LabVIEW Datalogging and Supervisory Control (DSC) module.

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