FAULT INFORMATION PRESERVING SYSTEM

PURPOSE:To provide a means, which can precisely specify the time of generating fault information to be preserved, effective for analyzing any serious fault detected at an entire system. CONSTITUTION:A master information processor 1 connects slave information processors 2-1, 2-2 and 2-3. At the master information processor 1, a first timer unit generates reference time. A state check instruction counter increases at fixed intervals. An interruption interval storage register stores interruption intervals. A comparator part compares the state check instruction counter with the interruption interval storage register. When they are coincident, a first microprocessor transmits an operating state check command. The command is received at the slave information processors 2-1, 2-2 and 2-3, and a second timer unit starts counting the presice time from that time point. A second microprocessor stores the time information of the operating state check command and fault information with the time information of the second timer unit in an error trace area.