描述
负载可在多处启动和停止，可以将多个启动信号并联，将多个停止信号串联，分别送给可编程序控制器的两个输入点，如图5所示。与每一个启动信号和停止信号占用一个输入点的方法相比，不仅节约了输入点，还简化了梯形图电路。
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