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What is the correct NodeId?

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support
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24 Apr 2024 04:58 #12734 by support

Replied by support on topic What is the correct NodeId?

1. We have discussed this is length already. NONE of the formats *IS* the NodeId. None of them is good or wrong, per se. NodeId is a structure. They are both some string *representations* of the NodeId. With QuickOPC, use the one that QuickOPC has.

2.You can strip "nsu=http://opcfoundation.org/UA/" if you like, because it is the default namespace (OPC UA standard namespace, defined by OPC Foundation). You cannot strip any other namespace, though.

3. "ns=0" is the default. Therefore "ns=0;i=2259" is the same as "i=2259".

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

The following user(s) said Thank You: micham

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micham
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23 Apr 2024 19:40 - 23 Apr 2024 20:01 #12733 by micham

What is the correct NodeId? was created by micham

Hi,

When browsing the CPP UA Server (by Unified Automation), using UA Expert and when browsing and choosing the ServerStatus.State item,

UA Expert shows this NodeId: "NS0|Numeric|2259". See below.

CaptureUAExpertCPPServerServerStatus.State.JPG

When doing the same with our program that is based on the Quick OPC Browser we get the following NodeId:

ExpandedText = "nsu=http://opcfoundation.org/UA/ ;i=2259"

1. What is the correct NodeId, the one in UA Expert or in Quick OPC Browser?

2. Currently we strip the "nsu=http://opcfoundation.org/UA/ ;" from the NodeId and use this" "i=2259". Is this Okay?

3. Or should we use "ns=0;i=2259"? How can we know if it is "ns=0"? "ns=1"? etc...?

Thanks.

Michael

Last edit: 23 Apr 2024 20:01 by micham.

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