| 摘要 |
PURPOSE:To read abnormality information from a normal system with an ordinary tool when abnormality occurred in one system of a duplex system by connecting each system of the duplex system mutually through a two port memory section. CONSTITUTION:When abnormality occurred in one system of a duplex system, the CPU1a of a system 1 writes abnormality information of own system in a two port memory section 1d of the system 1. The memory section of the system 1 is connected to the CPU2a of the other system 2a by a bus 3, and abnormality information of the system 1 set by CPU1a of the system 1 can be read out through the CPU2a which is operating normally. When abnormality occurred in the system 2, abnormality information can be read similarly through the CPU1a of the system 1. Thus, when abnormality occurred in a system, abnormality information can be read from the other normal system with an ordinary tool. |
