Answer:
Continuous model (F):
Blue light: Indicate that the module works normally in forward and reverse directions;
Red light always on: Indicate that the module is abnormal, generates an unrecoverable alarm, and needs to be restarted;
Red light flashes: Indicate that the module is abnormal, generates an recoverable alarm, and can recover automatically;
Discontinuous model:
Blue light: Indicate that the module works normally in forward direction (rectification: AC-DC);
Green light: Indicate that the module works normally in reverse direction (inversion: DC-AC);
Red light always on: Indicate that the module is abnormal, generates an unrecoverable alarm, and needs to be restarted;
Red light flashes: Indicate that the module is abnormal, generates an recoverable alarm, and can recover automatically;