PI WS and OPC UA: Compare and Contrast

Blog Post created by smohr on Aug 27, 2009

Since we had the OPC UA webinar yesterday, I think it would be appropriate to make a very brief point about the two prospective products.  OPC UA goes the big standards route.  You have to invest in a lot in terms of the object model and infrastructure, but it offers a lot in return.  If you want industry  standards and a big, robust infrastructure, OPC UA is your path.  PI Web Services, in contrast, was designed from the start to be the way to get data out of PI with a minimum investment of time and effort.  I'm grossly oversimplifying, but the only things the two have in common is web service protocols and PI data.


So -- do you think the path-context-manner-column calling convention meets that design intention?