Description
用继电器—接触器控制完成一项控制工程，必须首先按工艺要求画出电气原理图，然后画出继电器屏（柜）的布置和接线图等，进行安装调试，以后修改起来十分不便。而采用PLC控制，由于其靠软件实现控制，硬件线路非常简洁，并为模块化积木式结构
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