Description
考虑到节省改造改费用，应尽量压缩输入、输出点数。在某些场合，输入点可以一点两用。如某行程开关只在自动循环时有用，而某按钮只在手动调时用，当输入点不够时，则可将上述两个输入信号共用一个PLC输入点，利用PLC的转移标号指令，不会使两个信号混淆
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