In the process of industrial production, the demand of control precise is higher and higher. PAC is a new type of programmable automation controller, the control performance, information processing and network communication ability have some significant advantages. PAC controller combines the inherent reliability, robustness and distribution characteristics of PLC, and compared with PC control, the PAC using realtime operating system, on the processing performance with certainty and realtime PC incomparable advantages. On the basis of the traditional PAC controller, adopting the improved PID control algorithm, the adaptive fuzzy PID control algorithm, therefore can improve the control precision and the control response, higher control requirements.