Export Node IDs of an OPC UA server

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1

Hello,

Is there a way to export/get the Node IDs from opc ua server in an xml format (or some other format) using automation studio (or scirpts …)

Thanks,

Best regards,
Mohammed Ali

2

You can check the following folder on your project for a OpcUaMap.uar.gz file, after extracting the .gz to just OpcUaMap.uar file it is in XML format and contains the Node IDs (and a whole lot of other information). These files should be created after a project build.

Temp\Objects\<ConfigName>\<CPU>\OpcUaMap

Other location

Temp\Transfer\<ConfigName>\<CPU>\FilesToTransfer\AddonsData\OPCUA\NodeSet\Generated

You could then write a script in your chosen language to clean up or refine the information with the Node IDs.

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3

Hi Tommi,

Do you have an example of how you can start an server with this .xml?
What programming language you use for it?

4

Hello Tom,

If you mean using the XML to start a OPC UA client, I don’t have any examples. Maybe @Mohammed_Ali can give some more information how he has used the files?

But you would not use these files to start any OPC UA servers, would really not make any sense. (Except the B&R Automation Runtime OPC UA server, which uses the nodeset file automatically).

5

Hi,

What we want to do is to start an python server with the same structure as in AS. The structure that we create in the python server we want to read this out on the PLC but for now it’s only working on single variable and not structures.

Maybe someone nows an better solution?

6

I am assuming you want to use this for some kind of testing?

If it is not a problem you could just start an ArSim instance, OPC UA server is accessible in simulation. You can also just copy the simulation folder to a separate PC if required, it does not need an Automation Studio installation, or a license if it does not need to run more than 2 hours continuously.

7

Hello @Tom_Schellekens,

If you are looking for a way to test your opcua server, using ARsim is a very good tool for that (as @tommi.piiparinen said). you can run it in your computer and see data from UaExpert (or any other opcua software).

If you really need to create the server via a python, it is possible with opcua library.
I haven’t finished my tests with this method so i don’t have a complete script for you.
Python OPC-UA Documentation — Python OPC-UA 1.0 documentation

Best regards,

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8

Hi guys,

For the python side I would recommend using “asyncua” library, as “opcua” library is deprecated.
Here is the link to the repo : FreeOpcUa/opcua-asyncio: OPC UA library for python >= 3.7
There is a lot of example in “example” folder on the repo.

Best regards,

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