620-0048 Honeywell模块

PLC的外部硬件电路是控制系统的外部接线，

是PLC内部CPU和现场被控设备之间联系的

桥梁。

可以将梯形图想象成一个控制系统内部的“电路”。

PLC采用可编程序的存储器，用来在其内部存储执行逻辑运算、顺序控制、定时、计数等操作的指令，并通过输入输出接口，控制电动机等电器、机械设备。


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