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Reading Hart signals from OPC interface

I've been asked to add Hart signals that come into DeltaV, to our OSIsoft PI Historian. Our current DeltaV-PI link is via OPC, but I have no idea how to access the Hart data. Do I have to create a reference in a DeltaV module and then link to that, or can I link directly to another OPC sever on the DeltaV system that allows access to the Hart signal?

Any help much appreciated!