On Remote Monitor and Control Based on OPC and ASP.NET

Aiming at the remote monitor and control in industry, the paper presents a scheme to integrate information and Web services based on OPC (OLE for Process Control) and ASP.NET technology. The proposed scheme took the remote monitor and control of a water tank system on the Ethernet as an example, which utilized the OPC technology to set the communication between PC and PLC, and established the RTDB (Real-time Database System) to read the data and control variable from OPC Server by programming with VC++. It used ADO.NET technology to dynamically visit the real-time data based on ASP.NET and inquiry the history data from RTDB. The experiment result shows that the monitor and control system works better and obtains more real-time. It proves that the scheme can realize Web monitor and control effectively.