| 摘要 |
PURPOSE:To surely execute the normal program even if a fault is generated in a program executing device and a program store device. CONSTITUTION:Multiplexed program executing devices 4, 5, and multiplexed program store devices 100-400 are provided, and by the present program executing device, the program store device used by the next program executing device is designated so as to be different from that which is used by the present program executing device. In the case the program cannot be executed by the present program executing device, the next program executing device executes the program by using the designated program store device. |
