电梯单台演示PLC程序，采用西门子STEP200硬件环境，梯形图编写，可实现8层电梯的简单功能，关于群控方面需要优化，对大学本科生毕业设计绰绰有余。-PLC elevator demo single procedure, using Siemens STEP200 hardware environment, and the preparation of ladder can realize a simple 8-storey elevator function, on the need for group control optimization, the design of university undergraduate students graduating from more than sufficient.