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摘要本文在阐述电梯和PLC的结构并工作原理的基础上，使用PLC（西门子S7—200 CPU226)及其扩展模块，设计了一个四层的电梯的控制系统.设计了电梯的拖动回路，选择了曳引电机，并使用了安川616G5变频器，设置了控制方式参数、运行方式参数、S特性曲线参数等变频器参数，实现了曳引电机的启动、制动与调速。
采用模块化编程思想使用STEP7-MicroWIN SP9软件编写了梯形图，并通过梯形图，实现了包括电梯的启动与制动、楼层指示功能、轿厢内指令和轿厢外召唤信号的登记与消除、电梯运行方向的控制、电梯的开关门、超重报警和手动按响警铃等功能。
最后,使用S7-200编程仿真软件做了部分功能的仿真。
关键词：四层, 电梯， PLC, 控制系统ABSTRACTThe structure and working principle of the elevator and the programmable logic controller （PLC) are introduced and PLC (Siemens S7—200 CPU226）whit its extension module is used in the design of a four—storey elevator control system in this paper。
To designing the drag circuit of the elevator, major parameters of traction motor is selected and Yaskawa inverter is used to controlling the speed of the traction motor whit it’s parameters set, such as control mode parameters, operation mode parameters, S characteristic curve parameters and so on. Using the step 7-MicroWIN SP9 software to compiling ladder diagram，many functions, including elevator starting and braking, the floor indicator function，the car instructions and the car outside the call signal of registration and eliminate, running direction of the elevator control，elevator door switch, overweight alarm and manual according to sound the fire alarm, is realized。
