Hello I got the OPC UA server running and connected to my VC simulation.
However when I try to pair 2 variables I get the following error
I’m trying to understand what is going on here. Any help is apreciated.
By the way I am trying to connect an integer property value in the sim to an integer data type in my PLC.
as shown in this picture
zesty
May 26, 2023, 4:50pm
2
What PLC?
If the OPC UA server of that PLC does not specify a limit it is by default 0 if I recall so just ignore the error and keep on trucking *honk *honk
That limit is helpful to know, so the client does not send more updates than the server can handle, but hey who needs limits?
1 Like
Hi Zesty
Thanks for the quick response!
I’m connecting to a UPC UA server created by factorytalk gateway connected to studio 5000 logix emulate virtual PLC.
The communication seems to work perfectly fine so I think you are right and I can just ignore the error.
I’m not too familiar with OPC and how to get to those limit settings. But seems to be all good.
TSy
May 26, 2023, 7:23pm
4
The OPC UA standard defines these properties that are optional for the server to provide, but must not be 0. So that server is not standard-compliant.
See:
Any operational limits Property that is provided shall have a non zero value.
https://reference.opcfoundation.org/v104/Core/docs/Part5/6.3.11/
VC reads those limits from the server if they are available, and then tries to optimize the reads from server by reading all the variables in a cyclic group with a single request if it fits into the limits.