OPC Unified Architecture (UA), the most recent OPC specification from OPC Foundation, replaces the protocols of its predecessors. OPC stands for OLE for Process Communication, but I would call it as Open Protocols for Connectivity. Hope you will agree with my new definition for OPC (Open Protocols for Connectivity)

OLE/DCOM based process communication is going to be part of the history. OPC UA supports two protocols, binary and Web service (SOAP).

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