Primary fault determination method and device, storage medium and terminal equipment

The invention discloses a first fault determination method, which is suitable for a PLC processor, the PLC processor comprises n fault data storage sub-regions, n fault mark registers and an output state register, and the first fault determination method comprises the following steps: obtaining a fault signal, fault information corresponding to the fault signal is stored in the target fault data storage sub-region; when it is monitored that the target fault data storage sub-region changes, (n-1) fault flag registers associated with the target fault data storage sub-region are refreshed, so that the state value of a corresponding fault flag bit changes; the output state register generates a control signal according to the received state value of each fault flag bit; and comparing the control signal with a preset first fault control signal, and judging a first fault. According to the method, the first fault is judged, so that the fault processing efficiency of after-sales maintenance personnel is improved. 本发明公