In accordance with the requirements of production process, the PLC system can implement automatic control of the production process. Through communication with the host machine, data exchange and instruction transfer are carried out, and complete the intelligent control of production line . The monitoring system of the upper computer can display the production process and the working state of production equipment intuitively and clearly, and record and statistics the data and information produced during the production process. It is open and extensible, easy to operate, maintain and upgrade. It has strong anti-interference ability and is suitable for industrial production environment. And can gather field manual operation and centralized control room.