With the continuous development of society, buildings are getting higher and higher, and elevators have become a necessary equipment for high-rise buildings. Elevator from the handle switch to operate the elevator, button control elevator development to the current group-controlled elevator, for high-rise transport has made an indelible contribution.<br>In order to allow passengers to use a more comfortable, safer, more environmentally friendly elevator, the analysis of the elevator is still very necessary, there is the basic structure of PLC control system, PLC applications and elevator advantages and disadvantages. PLC control overcomes many shortcomings of relay control elevator, has the advantages of simple programming, improving operation safety and easy maintenance, good flexibility and good expansion performance, enhancing anti-jamming ability, etc., and is applied to the setting of elevator control system.<br>PLC control system is mainly the use of PLC logic switch control function, through the PLC to control the elevator switch door, floor display, car and outside the hall of the call registration, overload alarm, orientation, start acceleration and brake parking and other modules. These are to analyze the elevator performance requirements, to determine the input and output port, and then to select the appropriate PLC model, and then assign I/0 port
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