Autocontrol Technology On The Basis Of Network Communication Between PC And PLC

With the development of industrial automation, the Distributed Control System has been gaining much success in the field of process-controlling. DCS is paid more and more attentions and applied widely.In the thesis, a fully automatic production line is designed and analyzed, and the software implement method of this system is discussed in detail. The construction of the system is on the basis of the current industry Ethernet technology. This unique DCS system consists of PC and PLC, which can achieve processing automation and information management automation.The thesis concentrates on the total structure of the production line with its synthesis procedures, the structure of control system and the functions of the main components, PLC's mode applied in the system, the architecture and data flow direction of software system, the function modules of main control program including reset module, self checking module, parameter extracting module, automatic production module and so on, the detail structure of database, the communication design of main control program, the database access design of main control program.In the thesis, database access technology is made full use of to decrease the workload of VC programming and the workload of program debugging.In addition, when researching how to implement automatization of production, the thesis puts forward a arithmetic, which makes full use of the function of datasheet's joint querying in the database. The arithmetic is of simple and effective.By adopting the method of database accessing, the control system is more flexible and more extensible. The control system has very strong malfunction detecting function to guarantee the safety of the whole production line.The production line has operated well at present.