Siemens SIMATIC PCS 7 Function Manual page 15

● OPC client runs on a separate computer
If the OPC client and the OPC server process run on separate computers, the OPC client
accesses a local and a remote proxy object. These objects communicate via RPC and a stub
object, with the OPC server object on a different computer.
Remote Procedure Call (RPC) is a technique used for communication between different
processes. The processes typically run on different computers.
OpenPCS 7
Function Manual, 05/2012, A5E02780178-02
2.6 COM / DCOM components of OpenPCS 7
Basics
15