Distribution master station and terminal synchronous on-line self-diagnosis method

The invention provides a distribution master station and a terminal synchronous on-line self-diagnosis method. According to the requirement of simulation transmission of a master station system, a distribution terminal simulates the data acquisition process of state quantity, analog quantity, controlled quantity, and digital quantity, and simulation data is sent to the distribution master station according to the requirement of information interaction; in the condition of not affecting normal power supply of lines, external test equipment is not employed, hard wiring of terminal acquisition and control loops is not changed, a group of lines with mutual connection are regarded as a unit, monitoring, control, communication, and operation state anomaly early warning of the distribution terminal and detection and test of a master station feed line automation FA function are realized, system real-time data processing and remote control function diagnosis are achieved, and the detection and self-diagnosis of events such as power supply, sampling, interference prevention, and transmission protocol of the master station, the terminal, and the communication network are realized.