描述
PNP型晶体管饱和导通时，电流经24V电源的正极(24V端子)、外部的触点或晶体管、X0等输入端子、内部电路和S/S端子，从0V端子流回24V电源的负极，使光耦合器中的发光二极管亮，光敏三极管饱和导通。
输入电路中设有RC滤波电路，以防止由于输入触点抖动或外部干扰脉冲引起错误的输入信号。滤波电路延迟时间的典型值为10～20ms(信号上升沿)和20～50ms(信号下降沿)，输入电流约5～10mA.
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