OLE for Process Control，It is the emergence of Windows-based applications and on-site process control applications to establish a bridge.
OPCStandards based on Microsoft's OLE technology, its development is to provide a set of standard OLE / COM interface to complete the OPC technology used in the OLE 2 technology, OLE standard allows multiple computers to exchange documents, graphics And other objects. The adoption of OPC technology makes it possible to solve industrial control with a simpler system structure, longer life, and lower price. While the field device and system connections are also more simple, flexible and convenient. So OPC technology in the field of domestic industrial control has been widely used, the main application areas are as follows:
1）Data acquisition technology
OPC technology is usually widely used in data acquisition software. Now many hardware manufacturers provide products with a standard OPC interface, OPC applications and industrial control equipment to achieve efficient and flexible data read and write, you can compile the standard OPC interface, client application software to complete the task of collecting data .
2）Historical data access
OPC provides a way to read historical data stored in a process data archive file, database or remote terminal device, and to manipulate and edit it.
3）Alarm and event handling
OPC provides a mechanism to notify the OPC client when an OPC server is abnormal and when the OPC Server Setup event arrives. By using the OPC technology, it is possible to better capture various alarms and events in the control process and to give the corresponding deal with.
4）Data redundancy technology
Industrial control software development, redundant technology is one of the most important technology, it is the system of long-term stability of the protection. The use of OPC technology can be more convenient to achieve software redundancy, but also has good openness and interoperability.
5）Remote Data Access
With Microsoft's DCOM (Distributed Component Object Model) technology, OPC enables high-performance remote data access capabilities, making data exchange between industrial control software more convenient.
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