| 摘要 |
PURPOSE:To discriminate a troubled device to be diagnosed without spending labor and time, in the case a stack trouble is generated in a common bus, in an electronic exchange for connecting plural devices to be diagnosed to a duplexed central processing system device by the common bus. CONSTITUTION:A central processing system device 100 is provided with a diagnosed device power source control means 101 for instructing turn-on/turn-off of a power source to each device to be diagnosed 200, and a diagnose executing means 102 for executing a diagnosis of each device to be diagnosed, connected to a common bus 6 in a state that turn-on or turn-off of the power source of each device to be diagnosed is instructed. Each device to be diagnosed is provided with a power source opening/closing means 201 for executing turn-on/ turn-off of the power source to the own device by designation of the diagnosed device power source control means, and a bus passing means 202 for detaching the own device from the common bus, in the case the power source to the own device is turned off, and maintaining the connection of a central processing system device and other device to be diagnosed. |
