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OPC UA Discovery Server

OPC stands for OLE for Process Control which clearly shows that it comes out of the Microsoft community, based on the OLE and DCOM technology.

OPC is a Client/Server based communication which means that you have one or more servers that waits for several Clients to make requests.

Once the server gets a request it answers to that and then goes back into wait state, but the client can also instruct the Server to send updates when such comes in to the server.

In OPC it’s the client that decides when and what data the server will fetch from the underlying systems, that is also true if the client subscribe to updates where the client decides how often the server should quire the systems.

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