Analog quantity signal output disconnection detection circuit

The invention discloses an analog quantity signal output disconnection detection circuit which comprises a constant current source output module, an optocoupler, an MCU chip, an optocoupler relay, a current output control module, an optocoupler relay and an output protection module. The constant current source output module is connected with the input end of the optocoupler, the output end of the optocoupler is connected with the input end of the MCU chip, the output end of the MCU chip is connected with the input end of the current output control module, the output end of the current output control module is connected with the input end of the optocoupler relay, and the output end of the optocoupler relay is connected with the signal output port. The circuit can realize detection of analog quantity signal output disconnection, and the detection cost is low. 本发明公开了一种模拟量信号输出断线检测电路，包括恒流源输出模块、光耦、MCU芯片、光耦继电器、电流输出控制模块、光耦继电器及输出保护模块；恒流源输出模块与光耦的输入端相连接，光耦的输出端与MCU芯片的输入端相连接，MCU芯片的输出端与电流输出控制模块的输入端相连接，电流输出控制模块的输出端与光耦继电器的输