| 摘要 |
PURPOSE:To prevent the subject system from the situation of immediate system- down, by collating duplicated system constitution control circuits so that the disagreement between the circuits can be avoided. CONSTITUTION:In duplicated system, crossing is made for the order transmission/ reception bus between the central processing unit CC and the bus interface unit BIU and the system constitution is determined with the system constitution control circuit MSD. The failure information relating to the circuit MSD is transmitted to the maintenance scanner MSCN of the system belonging to the device MSD, and the device CC detects failure information by the periodic scanning to the device MSCN. When the device CC detects the failure information, the system belonging to the failed circuit MSD is separated. Next, the circuit MSD transmits the system constitution control data to the circuit MSD in other systems, and the disagreement of the system constitution control data can be prevented by mutual collation through the reception of data from the circuit MSD of other systems. |
