To easily specify a failure location by answering an extension application for extending a count time set by a counting means to a resource managing means if an instruction can not be executed.
If an abnormal end is received from a remote adapter before a time-out (S1007), the failure of a communication line is acknowledged (S1008). If a resource management part receives the extension application for a timer from the remote adapter before the time-out, the resource management part performs a process for extending the set time of the timer (S1010). Consequently, the set time (time-out value) of the timer is extended and the timer continues to clock the time. Further, if the timer enters a time-out state while none of a normal end, the abnormal end, and the timer extension application is received from the remote adapter (S1011), the resource management part acknowledges device failure of the remote adapter (S1012).
SUGAWARA HIROMI
FUJIMOTO NAOMI
