At present, the elevator control system is controlled by PLC instead of microcomputer. Or use the microcomputer as the signal control unit to complete the elevator signal collection, operation state and function setting, automatic scheduling and elevator function centralized selection. In the control method and performance, PLC reliability is high, the program design is convenient and flexible, low cost. Therefore, this design adopts PLC to realize the centralized selection control of elevator.Like other elevator control systems, PLC elevator control system is mainly composed of signal control system and resistance control system. Figure 3.1 is the overall structure of the ELEVATOR PLC control system. The main hardware includes PLC host and extension, mechanical system, vehicle operation panel, hall call board, floor fingerboard, door crane, speed control device, main tractor. The core of system control such as mobile system is PLC host. The operation panel, the call panel, the well and the safety protection signal are sent to the PLC through the PLC input interface, and then to the drag system through the software program control, so as to meet the elevator starting, accelerating, decelerating and braking control functions. Run up and down.