PROGRAM UPDATING METHOD

摘要

PROBLEM TO BE SOLVED: To control a necessary part such as a power source supply part and a cooling part by a multiplexed controller even during the update of the control program of the multiplexed controller. SOLUTION: A control program is stored in a changeable part 54 of each ROM of multiplexed controllers 21 and 22, and an update control program for controlling the update of the control program according to program information from an external device 60 in response to a request for the update of the control program from the external device 60 is stored in a fixed part 53. The update control program is provided with a program part for executing the control of a necessary part such as a power source supplying part 23 and a cooling part 24 when the controller receives a control request instruction for the necessary part from the other controller during the update of the control program. The controller executes the control of the necessary part according to the update control program at the time of receiving the control request instruction for the necessary part from the other controller during the update of the control program according to the update control program.