DCOM configuration

Classic OPC server and client applications are based on Microsoft’s COM/DCOM communication model. The type of communication depends on the network configuration:

• Component Object Model (COM)

  Provides a set of interfaces that enable software components to communicate on a single computer.

• Distributed Component Object Model (DCOM)

  Extends COM to enable software components to communicate between network nodes.

  DCOM enables a process on one computer to request another computer to execute programs on its behalf, so permissions must be granted carefully to maintain security.

  Note: DCOM permissions must be granted to the accounts under which the OPC server and PI Interface for OPC DA run, even if you are using the same node for both the OPC server and the OPC client.

For details, see DCOM Security and Configuration.