Using programmable logic device CPLD as the controller, CPLD has the characteristics of complex operation, large scale, high density, small volume, high stability, rich I / O resources and easy function expansion. The parallel input-output mode is adopted to improve the processing speed of the system, which is suitable for large-scale control system as its control core. But this system does not need the complex logic function, to the data processing speed request is also not very high. And from the use and economic point of view, finally abandoned this program.