ABB 系统模块 SAFT 185 TBC

ABB 系统模块 SAFT 185 TBC

ABB 系统模块 SAFT 185 TBC

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。SAFT185TBC

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。

ABB 系统模块 SAFT 185 TBC

The input/output interface is the interface circuit connecting the PLC with the industrial field control or detection components and executive components. PLC input interface has DC input, AC input, AC-DC input and other types; The output interface includes transistor output, thyristor output and relay output.

Transistor and thyristor outputs are contactless output circuits, transistor output is used for high frequency low power load, and thyristor output is used for high frequency high power load. The relay output is a contact output circuit for low frequency loads. SAFT185TBC

The field control or detection components input various control signals to the PLC, such as limit switches, operation buttons, select switches and other sensor output switching or analog quantities, and convert these signals into signals that the CPU can receive and process through the input interface circuit. The output interface circuit converts the weak current control signal sent by the CPU into the strong current signal output required by the field to drive the actuator of the controlled device such as the solenoid valve and contactor.