1756-CNB/D
1756-CNB/D
1756-CNB/D
PLC一般接受行程开关、限位开关等输入的开关量信号。输入接线端子是PLC与外部传感器负载转换信号的端口。输入接线，一般指外部传感器与输入端口的接线。
输入器件可以是任何无源的触点或集电极开路的NPN管。输入器件接通时，输入端接通，输入线路闭合，同时输入指示的发光二极管亮。
输入端的一次电路与二次电路之间，采用光电耦合隔离。二次电路带RC滤波器，以防止由于输入触点抖动或从输入线路串入的电噪声引起PLC误动作。
若在输入触点电路串联二极管，在串联二极管上的电压应小于4V。若使用带发光二极管的舌簧开关，串联二极管的数目不能超过两只。
备货，备货，降降降，火火火，火火火……
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