| 摘要 |
PURPOSE:To cope with the fault occurrence of an input/output device effectively by providing an input/output controller and a fault counting part between a host device and the input/output device. CONSTITUTION:A central processing unit CPU is connected to plural input/output devices I/O through the input/output controller IOC. The input/output controller IOC has a polling device PL and a control processor muP. The fault monitoring device EDT in the input/output controller IOC generates an error state when informed of fault occurrence and sends it to a fault value counting part ECN. The fault value counting part ECN consists of memories MM-A- MM-C, a large/small judging circuit CP, and a +1 adding circuit AD. The fault occurrence information from the fault monitoring device EDT is summed up in the memory MM-A successively and when the cumulated value attains to a specific value, a fault information signal is sent out to the central processing unit CPU to send out a control stop signal to the input/output controller IOC. |
