摘要 |
<p>PURPOSE:To monitor the abnormality by comparing the time required for the completion of all of plural state transitions included in a part designated by a random part designating means with a common monitoring reference time set by a common monitoring reference time setting means. CONSTITUTION:The monitoring timer 13 of a fault diagnostic device 10 is cleared and the copy of monitor data stored in a RAM 15 is formed in a work area consisting of a RAM 16. If sampled monitoring data are not the same as the monitoring data which are temporarily stored in the RAM 16 and is obtained by preceding sampling, the state of the transition of a transited signal is extracted. It is checked whether the same data as the monitoring data are present on reference data copied to the work area of the RAM 16 or not. When the transition time is within a normal range, the 'random' flag/occurrence flag of reference data copied to the work area of the RAM 16 is set. When the transition time is not within the normal range, a prescribed processing for abnormality detection is executed.</p> |