Safety input circuit, circuit fault detection system, and circuit fault detection method

According to the safety input circuit, the circuit fault detection system and the circuit fault detection method provided by the invention, the first channel input circuit and the second channel input circuit which perform input sampling by using the ADC are arranged to realize subsequent circuit obstacle detection according to the voltage values of the sampling ends ADC1 and ADC2, so that the anti-interference capability can be effectively improved; the production efficiency and the production safety are improved. 本发明提供一种安全输入电路、电路故障检测系统以及电路故障检测方法，通过设置利用ADC进行输入采样的第一通道输入电路以及第二通道输入电路来实现后续根据采样端ADC1以及ADC2的电压值来进行电路障碍检测，可有效提升抗干扰能力，提升生产效率及生产安全。