Patent ID: 6898499

Claim:
A control system comprising: a first control unit operable to perform data communications; and a second control unit operable to perform data communications, wherein the first control unit and the second control unit share data with each other, wherein the first control unit comprises: a first transmitter operable to transmit data to the second control unit when a position of a first switch connected to a power supply is detected as being changed to an off position; and a power supply cutoff circuit operable to cut off the power supply to the first control unit after the transmission of the data to the second control unit by the first transmitter is completed, and wherein the second control unit comprises: a first storage controller operable to store the data transmitted from the first control unit in a first storage unit; and a power switching circuit operable to detect a change of the first switch to the off position and to switch the power of the second control unit to backup power.