140DDM69000

输入输出接口是PLC与工业现场控制或检测元件和执行元件连接的接口电路。PLC的输入接口有直流输入、交流输入、交直流输入等类型；输出接口有晶体管输出、晶闸管输出和继电器输出等类型。晶体管和晶闸管输出为无触点输出型电路，晶体管输出型用于高频小功率负载、晶闸管输出型用于高频大功率负载；继电器输出为有触点输出型电路，用于低频负载。

现场控制或检测元件输入给PLC各种控制信号，如限位开关、操作按钮、选择开关以及其他一些传感器输出的开关量或模拟量等，通过输入接口电路将这些信号转换成CPU能够接收和处理的信号。输出接口电路将CPU送出的弱电控制信号转换成现场需要的强电信号输出，以驱动电磁阀、接触器等被控设备的执行元件。

140DDM69000

140DDM69000

140DDM69000

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