1756-M16SE
1756-M16SE
1756-M16SE
从PLC控制系统与电器控制系统比较可知，PLC的用户程序（软件）代替了继电器控制电路（硬件）。因此，对于使用者来说，可以将PLC等效成是许许多多各种各样的“软继电器”和“软接线”的集合，而用户程序就是用“软接线”将“软继电器”及其“触点”按一定要求连接起来的“控制电路”。
为了更好的理解这种等效关系，下面通过一个例子来说明。如图1所示为三相异步电动机单向起动运行的电器控制系统。其中，由输入设备SB1、SB2、FR的触点构成系统的输入部分，由输出设备KM构成系统的输出部分。
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