Patent attributes
A backup control method is proposed to include: (A) two control units executing firmware such that the control units respectively operate in a master mode and a slave mode; (B) the control unit that operates in the master mode generating a health signal when executing the firmware; (C) a logic arithmetic unit determining, based on the health signal, whether the control unit that operates in the master mode functions normally; and (D) when the control unit that operates in the master mode is determined to not function normally, the logic arithmetic unit controlling a light emitting element to emit light, and notifying the control unit that operates in the slave mode such that the control unit which operates in the slave mode enters the master mode.
