DCOM clients and servers

OPCAE servers are DCOM servers, and OPCAE clients are DCOM clients, but the roles are not fixed.

PI Interface for OPC AE retrieves data from the OPCAE server using asynchronous callbacks. During a callback, PI Interface for OPC AE acts as a DCOM server, while the OPCAE server acts as a DCOM client. For this reason, DCOM security on the interface node must be configured to allow access by the account associated with the OPCAE server.