Let me know any open source OPC UA modules are available in node-red
Yes, I have used node-red-contrib-opcua to add an OPC UA Client to Node-Red.
I advise some caution here, particularly with the Browse node. The last time I tested this, the Browse node created a “behind the scenes” issue where Node-Red would keep opening and closing socket connections, even when the flow was not running. This would eventually crash the CODESYS OPCUA Server (my understanding is that SP21 will fix this issue, but WAGO does not have a released SP21 target yet). Repeated calls of the Browse node will have an additive effect and exacerbate the issue.
can you please give sample json code or any link for how to read and write the data from OPCUA server through node-red client
Here’s an example that illustrates subscribing/unsubscribing to an array of points and also write to an array of points.
flows (1).json (8.9 KB)