Development and Realization of Real-time Data Exchange between OPC Client and Multiple Remote Servers

The submitting of OPC (OLE for Process Control) has promoted the progress of the data collection in process control and industrial automation, and formulated the industry standard for the process real-time data exchange. Aiming at the key problem of ensuring the use of application program as OPC client to link multi-remote OPC server and real-time collect process data in control system, OPC technology and the connection and access technology of multi-remote OPC server were introduced and analyzed in detail. The multi-remote OPC server architecture is developed and analyzed based on the OPC technology and the automation interface. And the OPC client application is developed in order to connecting multiremote OPC server. Multi-remote OPC server communication case is achieved by the design of test software. Therefore the OPC client can calibrate and acquire progress data though calling the interface provided by the OPC server. Finally by establishing the suitable system architecture, configuring the corresponding environment variable and calling the corresponding test software program, the real-time data exchange between OPC client and multiple remote servers are achieved. This method has been successfully applied to develop the DCS I/O communication and control loop error test software, and provided better performance.