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OPC-UA scanning network and opcserver using C#

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23 Oct 2025 14:36 #14420 by den Bekker
Replied by den Bekker on topic OPC-UA scanning network and opcserver using C#
Yes, thank you. It reports the properties.
The following user(s) said Thank You: support

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22 Oct 2025 15:10 #14416 by support
Replied by support on topic OPC-UA scanning network and opcserver using C#
Hello.

It will be similar to this example:  opclabs.doc-that.com/files/onlinedocs/OPCLabs-OpcStudio/Late...%20of%20a%20single%20node.html

But the attribute Id used will be UAAttributeId.AccessLevel. (more info about the bits:  reference.opcfoundation.org/Core/Part3/v104/docs/8.57#_Ref497896703 )

I hope this helps. Let me know if you need more info.

Best regards
 

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22 Oct 2025 14:14 #14415 by den Bekker
Replied by den Bekker on topic OPC-UA scanning network and opcserver using C#
Thank you. it's working.

Can I also check if a variable on the PLC is specified as Read-only, Write-only or R/W?

Best regards,

Ruud

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22 Oct 2025 13:29 #14414 by support
Replied by support on topic OPC-UA scanning network and opcserver using C#
Hello.

The following articles should provide what you are asking for:

- opclabs.doc-that.com/files/onlinedocs/OPCLabs-OpcStudio/Late...ring%20OPC%20UA%20Servers.html

-  opclabs.doc-that.com/files/onlinedocs/OPCLabs-OpcStudio/Late...%20UA%20Local%20Discovery.html

-  opclabs.doc-that.com/files/onlinedocs/OPCLabs-OpcStudio/Late...0UA%20Network%20Discovery.html

There is no "scanning" in the true sense of the word - the servers must register themselves with the discovery server for them to be discoverable in this way.
Then for nodes:

opclabs.doc-that.com/files/onlinedocs/OPCLabs-OpcStudio/Late...%20for%20OPC%20UA%20Nodes.html

Best regards


 

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22 Oct 2025 07:54 #14413 by den Bekker
OPC-UA scanning network and opcserver using C# was created by den Bekker
Where can I find an example how to scan for:
- all servers on the network
- scanning for all "variables" on a server (including read-write details??)

Normally our students nly have ONE OPC-UA server in the network that I would like to detect and should result in
the string: "opc.tcp://lxxxxx"
And then I would like to scan which variables are on that system to setup a list with access strinhgs
like this: "nsu=CODESYSSPV3/3S/IecVarAccess ;ns=4;s=|var|CODESYS Control Win V3 x64.Application.PLC_PRG.a"

 

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