| 摘要 |
PURPOSE:To enable the control of system constitution stable, by taking constitution so that the self-contained system constitution and control is made for an arbitrary double system controller, in the system having a plurality of double system controller. CONSTITUTION:The central processing units 21-1 to 22-n constituting a plurality of double system contollers and the fault detection timers FDT 23-1 to 24-n detecting the failure signal provided corresponding to the units 21-1 to 22-n are provided, and the normality of the units 21-1 to 22-n is monitored with the signal of FDT 23-1 to 24-n. The overflow displays 25-1 to 26-n are provided with the units 21-1 to 22-n, which show the signal taken place by FDT 23-1 to 24-n. Further, the automatic selection enable displays 27-1 to 28-n representing that the units 21-1 to 22-n can automatically selected are provided, allowing to determine the units 21-1 to 22-n in advance, which can constitute the system. The logical product between the both displays 25-1 to 26-n and 27-1 to 28-n is taken with the selection control circuit 29 at the occurrence of fault and the output performs selection control. |
