The Application of the Fuzzy Controller Based on PLC in Sewage Disposal System

In order to solve the problems such as long time-delay, non-linear and the difficulty to establish an accurate mathematical model emerged in industrial field, we combine advanced intelligent control method with traditional automated devices, and put forward a Fuzzy Controller in accordance with the principle of fuzzy control and the characteristics of PLC. The Fuzzy Controller realized on the basis of Siemens S7-300 PLC and programmed in ladder diagram. And had an application in the sewage disposal electric control system of HuLunbeier DongNeng Chemical Plant. On-site debugging also proved that the fine efficiency, reliability and intelligentization of this fuzzy system are superior than traditional PLC automatic control system, which has broad application prospects.