Motion control system based on PLC, as an important application part in the field of electrical automation, has been widely used in production and life. Motion control mainly includes two kinds of motion control: frequency converter and servo. The research of motion control mainly starts from the motor motion and the state of its driving device. Micro 850 PLC supports motion control function, and has certain advantages in realizing frequency conversion and servo control. The lead screw is an excellent product which can convert back and forth rotary motion and linear motion. Generally speaking, the lead screw is used in precision machinery, with high precision. It can turn the rotary motion into linear motion, which is conducive to the improvement of production efficiency and qualification rate. The function of frequency converter is to change the power frequency power supply into the power control device with different frequency, mainly with the help of power semiconductor devices. At present, servo driver is widely used in the market, which is mainly used for the control of servo motor. It is a part of servo system, mainly similar to frequency converter. It can input parameters through configuration interface and communicate with PLC to control inverter and servo driver.