Control system of SHEN self-cleanign filter is a programmable PLC controller specially developed by our corporation. It has functions of human machine interaction control, Chinese program and Chinese display. Controller has differential pressure or time synchronization control, that is. No matter which program reaches set point, cleaning program can be started. And contious cleaning operation is also workable. When failture arises, alarm signal or relevant action shall also appear.In summary, it is much convencient.