Along with the development of modern science and technology progress and development, at present, the automatic control system is an advanced control technology and intelligent control technology as the core of the integrated automation control, its connotation and deepen constantly expand, including electrical transmission control technology, electrical control system and electrical control technology, low voltage electric PLC distribution automation system in the full play of their powerful Use scope covered from alternative relay simple control to more complex automation Covering a wide applications, all with automatic detection and automatic control of industrial and civil related fields, including all kinds of machine tools, machinery, electric power facilities, civilian facilities, environmental protection equipment, Such as: stamping tools, grinding machine, printing machine, rubber, chemical machinery, central air conditioning, elevator control system, the Textile control field is PLC system is an important application field, with the rapid development of PLC control areas of development is The wide application of PLC in the background of modern control field, the control system of data processing ability, real-time and stability put forward higher Siemens PLC with its high speed, low energy consumption, good stability and programming is easy to occupy the most PLC SIMATIC S7-200 PLC on its high reliability, extremely rich instruction set, is easy to grasp, convenient operation, rich built-in functions, characteristics, the integration of real-time communication ability, strong expansion module of the advantages of the medium of PLC Therefore this paper combining SIMATIC S7-200, CPU224 advantage, design a PLC to control platform to drive the contactor and electromagnetic valve to control Learn not fool me translate software, I can see out