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  9. What NodeId format is Acceptable?

What NodeId format is Acceptable?

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01 Nov 2024 11:34 #13255 by support
Replied by support on topic What NodeId format is Acceptable?
Hello.
Node Ids, as such, are defined by the OPC UA server, and QuickOPC does not care. You will find the node Ids either by browsing the server itself, or from its documentation.

In OPC UA, the node Id consists of a namespace (given by index or URI), and the "identifier". The identifier can be a string, integer, GUID, or opaque.

Your It is not clear whether your examples are actually node Ids. They look more like browse paths, which is a different concept. In addition, even if they were node Ids, the namespace is missing.

Which OPC Server are you using?
Suggestion: Run our Connectivity Explorer, browse the server, and when you select a node, it will show you its node Id.

More reading:
- opclabs.doc-that.com/files/onlinedocs/OPCLabs-OpcStudio/Late...tml#OPC%20UA%20Node%20IDs.html
- opclabs.doc-that.com/files/onlinedocs/OPCLabs-OpcStudio/Late...indices%20in%20Node%20Ids.html

I hope this helps. Feel free to ask if more is needed.

Best regards

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31 Oct 2024 20:25 #13253 by Cwardltu
What NodeId format is Acceptable? was created by Cwardltu
I am currently trying to read to a OPC value I have notice in a few examples do not work

If i am using this format "2:Data Type Examples/2:8 Bit Device/2:K Registers/2:Byte2" for the variable identifier I get BadNodeIdUnknown

If i am using this format "2:Data Type Examples.2:8 Bit Device.2:Registers.2:Byte2" for the variable identifier I get BadNodeIdUnknown

If I am using a format like this "Data Type Examples.8 Bit Device.K Registers.Byte2" the read works as intended

opcClient.Read(Endpoint, identifier);


what is the correct format? is there official documentation on what format this read method accepts?

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  9. What NodeId format is Acceptable?
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