Output module with functions of latching and feeding back digital quantity

The invention discloses an output module with latching and digital quantity feedback functions. The output module comprises an upper computer, a main controller and a digital quantity output module, the digital quantity output module comprises a single-chip microcomputer, a control signal latch, a digital quantity driver, a digital quantity output, an I/O interface, a digital quantity detector and a detection feedback. The upper computer sends an upper computer issuing instruction, the digital quantity output module outputs a module output signal, and the detection feedback module outputs a feedback signal; and the output module judges and guarantees the correctness of the digital quantity signal by comparing an instruction issued by the upper computer, a module output signal and a feedback signal. The method can detect the actual action condition of the digital quantity output interface of the module, and whether a command slave sending mechanism is carried out or not according to the feedback state. And the