降低了控制系统的项目费用。三菱PLC的功能十分强大，I/O点可扩展到128点，且可增加扩展板或特殊

的功能块，PLC具有的数据连接和通信功能选项使得其产品在通信和特殊功能模块的应用方面非常方便。

关键词：PLC   运料车   三相异步电机

Abstract: the MITSUBISHI PLC is applied to the electric control system of the material handling trolley, which can realize the automatic movement control of the material transport car and reduce the project cost of the control system. MITSUBISHI PLC is very powerful, I/O