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Four storey elevator graduation design paper controlled by MITSUBISHI PLC A kind of elevator PLC control system is introduced in this paper. Elevator is a vertical transportation equipment, and it is an indispensable transportation equipment in high-rise buildings. It relies on electricity to drag a car that can carry people or things, and does a vertical lift in the guideway of the building's well. It plays an important role in people's life. And the PLC system that controls the operation of elevators also requires higher and higher requirements, so as to achieve the goal of "stable, accurate and fast" operation of elevators. The system is mainly composed of PLC and logic control circuit. It includes AC asynchronous motor, relay, contactor, stroke switch, button and luminous indicator.