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The OLE for process control specification (OPC) refers to a published series of standard system interconnectivity specifications. These specifications are based on Microsoft’s OLE component object (COM) and distributed component object models (DCOM).
All OPC specifications are maintained by the OPC Foundation, a non-profit organization.
OPC is a series of open standards for open connectivity. OPC’s first standard is known as the OPC data access specification (OPC DA). There are now hundreds of OPC data access servers and clients.
OPC technology attempts to provide lower connectivity costs to software vendors, while providing user flexibility. The original specification standardized process data acquisition, which was also used for other types of data such as alarms, events, historical data and batch data. Users may also select software suppliers based on features; and custom interfaces are not required.
Other advantages of OPC technology include: