I am new to OPC-UA and Ignition, and I try to learn how to read “tags” from Java using the Opc Foundation OPC-UA Java SDK.
I am able to read the bult-in nodes in the Ignition Server, for instance node 2258, which gives me the current time.
But I haven’t been able to find the correct nodeIds for a PLC device like Allen Bradley ControlLogix 5500 or the simulator device.
I have added the simulator device to my Ignition test-server, and the web-based OPC Quick Client gives me this information when I click on [r] right to the READONLYSTRING1-node:
Read completed. [Ignition OPC-UA Server][simulator2]READONLY\READONLYSTRING1
Status: StatusCode[Severity=Good, Subcode=NotSpecified, 0x00000000]
Quality: StatusCode[Severity=Good, Subcode=NotSpecified, 0x00000000]
Timestamp: 8/31/11 4:06:36 PM CEST
That looks good, but I am not able to read the same information from my Java test-client using the Opc Foundation OPC-UA Java SDK. Which nodeId should I use?