Introducing DCOM

Microsoft'sDistributed Component Object Model (DCOM) was created to facilitate distributed component technology - distributing Microsoft® software components across multiple computer servers.

DCOM was a natural progression from the standard Common Object Model (COM) framework, and while the COM framework can access multiple applications from a single server, DCOM can access multiple applications from a number of distributed servers on a company network.

OPC Classic servers and clients leverage Microsoft's COM/DCOM technology. This allows OPC Classic client applications to make programmatic calls across computer boundaries, and access information on any server on a company network.

Why do I need to configure DCOM security?

DCOM enables browsing of remote servers. Because OPC Classic clients are making programmatic calls across multiple servers on a company network, it is essential to ensure that the DCOM settings of the OPC Classic client are properly configured to enable access to the distributed servers. It is a matter of accessing data from the correct server, by the approved people, and the security surrounding this.


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CSense 2023- Last updated: June 24,2025