For OPC, a client can subscribe data change which happens on OPC server. Does PI AF provide a similar subscription function so that client using PI AF can subscribe data changes of tags? If a tag has a new snapshot data, then client will receive a notification of the data change.
Hi Johan,
What you are looking for is AFDataPipe class. If you are unfamiliar with how they work and how to implement them, I would strongly suggest taking a look at More about Data Pipes first. It is part of our "Developing Applications with PI AF SDK" course that is available on the Learn section of PI Square.
Gabriel
For PIPoint(s), there is the PIDataPipe. For AFAttribute(s), there is the AFDataPipe.
This online learning course teaches an introduction to PIDataPipe:
Developing Applications with PI AF SDK Discussion Forum
And there are lots of blogs and postings here from a simple PI Square search:
Suggest use "datapipe" or "data pipe" to catch any reference to PI or AF
https://pisquare.osisoft.com/search.jspa?q=datapipe
https://pisquare.osisoft.com/search.jspa?q=data+pipe
A good blog on the topic:
Achieve Maximum Performance With DataPipes and the Observer Pattern
Hi Johan
You can install PI OPC DA Server enables the functionality you are looking. Similar to other OPC servers, OPC client can connect and request data from PI.
PI OPC DA Server - Overview
Thanks
Lal