OPC(OLE for Process Control) is an industrial standard. The international organization that manages this standard is OPC Foundation, with more than 220 members. All over the world, including all the major automation control system, instrument and process control system companies in the world. Based on Microsoft OLE (now Active X), COM (Component Object Model) and DCOM (Distributed Component Object Model) technologies. OPC includes a set of standard interfaces, attributes and methods for process control and manufacturing automation systems.

In the signaling exchange theory of communication specialty, DPC refers to the destination point code, that is, "destination signaling point code", which indicates the destination code to which the signaling unit is sent. Corresponding to this is OPC (original point coding), that is, the starting point coding of signaling unit.