描述
例如某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。
New 1745-LP152/C Allen Bradley SLC 150 PLC 1745LP152
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ALLEN BRADLEY 1745-E101 NSPP 1745E101
ALLEN BRADLEY 1745-PT1 NSPP 1745PT1
ALLEN BRADLEY 1745-E145 USPP 1745E145
ALLEN BRADLEY 1745-E151 NSPP 1745E151
ALLEN BRADLEY 1745-E156 USPP 1745E156
ALLEN BRADLEY 1745-E157 USPP 1745E157
ALLEN BRADLEY 1745-LP153 USPP 1745LP153
Factory Sealed 1745-LP157 Allen Bradley 1745LP157 N843
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4637 NEW Allen-Bradley 1745-E105 Relay Expansion Unit
ALLEN BRADLEY 1745-E155 NSFP 1745E155
