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Multiple PI Buffer Subsystems are able to write to the same tag avoiding buffer lock. Please reference the background section of KB00093.
So, the best way is to confirm that both interfaces are sending buffered data. If they are both sending buffered data, then there should be no conflict and the point will be able to accept data from both buffer subsystem sessions.
Let me know if you have further questions!
Thank you for sharing the information, I have one query if the OPC interface and UFL interface are in two different interface node. Will the system consider the buffer in two machines as one? Will this scenario avoid the buffer lock, considering that we are writing data from both the interfaces via buffer subsystem.
The short answer is yes. I have seen cases where a tag is accidental being written to by multiple buffered data sources from separate nodes, usually perfmon interfaces. The only way this is possible is if all the data is being buffered.
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Also see the first bullet point from Jacob's screenshot: out-of-order data is never blocked by the buffer lock, regardless of whether it is buffered or not.