Application And Study On Communication Between PLC And Upper Computer In Supervising System

With the development of modern enterprise automation, the technical of computer control play an important role in modern control system, combing with computer technical and automation control theory. PLC technical and Network is the base of CIMS, at the same time, PLC technical is one of modern automation three support(PLC, robot and CAD/CAM).The paper is mainly discussed about the working principle and realizing method. And the paper study the super terminal of converting person computer into PLC and network and realize the technical of PLC control system data management and operation.Through the study of PLC working principle and PLC network communication basic theory, it is a main purpose to master the cruces of realizing PLC control system, the control process and control mode, PLC topology structure and communication protocol between sub network. The paper introduce the condition of communicating between person computer and PLC, the person computer asynchronism adapter and the high programming language communication interface principle of PLC. Form PLC monitoring system establishing , application on heat treatment product line of PLC network communication technical , combing with programming design principle, process method, interface technical and increment PID digital control arithmetic, the paper study on the core control technical of PLC and network monitoring system.