Industrial Control Research Based On Network

This paper depict the evolution of industrial control, from DCS to digital PCS. The PCS has realized a whole new completed distributed system, the control functions have been entire put to the industrial field. Depending on the field intelligent device, we can realize the foundational control function. Ethernet as a successful net technology has been widely used in business field. Because Ethernet's cost is low and Ethernet develop very fast in these years, people hope to use this technology in industrial field more and more .Based the analysis to net protocol of Foundation Field Bus and the research to MAC protocol of several field bus , we find the way that the field bus satisfied with the rigorous requirement of industrial control. Ethernet's MAC protocol is CSMA/CD so it can't confirm the time needed by the data via the network. But as the new technology been applied to the Ethernet :full-duplex technology, switch technology, Qos, OPC etc, Ethernet has been used in industrial control and real-time data exchange.Depending on the third part software PcAnyware and Pro/Engineer 3D CAD/CAM software, we do the net control for CNC system.Between CNC and local computer exchange G code through RS232, and the remote control local computer through network.We have established network environment for computer real-time control experiment based on the Web. The Client is made up of a Java 2 applet and a video window. The video server provides visual feedback on experiment. This experiment system has three parts: water level control of triple tank apparatus, electric heater for temperature control, temperature and humidity data collection. The server is consisted of a Web server and a C++ application, the application is used to response the client's Socket, and establish connection with the client, while this application exchanges data with the controlled device, the control method is embodied in this application too.