Re: R: epics-modules opcua + open62541

[Jörn Dreyer via Tech-talk <tech-talk at aps.anl.gov>]

Hi Antonio,

I had a short look at the EPICS OPC UA Device support module. This follows the concept of EPICS, that everything is a PV. So it uses only the exposed variables from your OPCUA server.
So this confirms your observation.
But open62541 supports services that you can call from code. But as this is device specific, you will probably need to develop a driver that knows exactly how to call the Execute() function inside your OPCUA server (device). I dont know if anybody has done something like that before.

Regards

Jörn


Am Montag, 24. August 2026, 09:13:18 Mitteleuropäische Sommerzeit schrieb Antonio Moschini via Tech-talk:
> Hi all,
> 
> any news about this topic ?
> 
> Thanks in advance
> Antonio Moschini
> 
> Da: Antonio Moschini
> Inviato: martedì 4 agosto 2026 15:13
> A: EPICS Tech Talk <tech-talk at aps.anl.gov>
> Cc: Paolo Galli <Paolo.Galli at ohb-italia.it>; Francesco Diprima <Francesco.Diprima at ohb-italia.it>
> Oggetto: epics-modules opcua + open62541
> 
> Hi all,
> 
> For an internal project, a customer is going to provide us an interface based on OPC-UA on which commands are exposed as instances of dedicated function block classes representing command objects. Each command is modeled as an OPC-UA object exposing an Execute() method and a set of variables representing the command status and the execution status. OPC-UA client will use the Execute() method to trigger the internal command.
> Inside EPICS modules (OPC-UA and/or Open62541), we haven't found any implementation related to that kind of methods.
> Is this correct ?
> Is there any workaround to use such a method ?
> 
> Thanks in advance
> 
> 
> 
> 
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