Emergency stop along the line, belt deviation, smoke, brake release not in place, longitudinal tearing, coal stacking at coal unloading point, fault display and buzzer alarm. The display program has the locking function, which can be eliminated only after reset; the control line along the line is broken and the high-voltage fault, the protection switch itself has the action self-locking function, and the console fault display signal can be removed only after the fault processing; the low-speed slip and temperature protection are completed by the corresponding intelligent digital display device, which provides the fault signal to the PLC.