OPC1 is a standardised interface giving access to process data. It is based on the Microsoft standard COM/DCOM2 and was extended to meet the needs of data access in the automation process where it is mostly used to read and write data from the controller. The typical OPC clients are visualisations and programs for recording operational data etc.. PLC systems and field bus cards are usually supplied with an OPC server.
The OPC server can be connected to an unlimited number of devices simultaneously
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