Description
DS200EVIAG1B GE
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,不节约了输入点,还简化了梯形图电路。
某些输入信号不进入PLC系统中有些信号功能简单、涉及面窄,如图6中的手动按钮、过载保护的热继电器触点等,有时就没有作为PLC的输入,将它们设计在PLC外围的硬件电路中同样可以满足控制要求。如果外部硬件电路过于复杂,则应考虑仍将有关信号送入可编程序
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