Description
直流输入电路的一种形式(只画出一路输入电路)。当图1中外部线路的开关闭合时,PLC内部光耦的发光二极管点亮,光敏三极管饱和导通,该导通信号再传送给处理器,从而CPU认为该路有信号输入;外界开关断开时,光耦中的发光二极管熄灭
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