OPC server provides a method for many different software packages (so long as it is an OPC Client) to access data from a process control device, such as a PLC or DCS. Traditionally, any time a package needed access to data from a device, a custom interface, or driver, had to be written. The purpose of OPC is to define a common interface that is written once and then reused by any business, or custom software packages.

All of the OPC Specifications are based on the OPC Client/Server model. Cl...


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