| 摘要 |
PROBLEM TO BE SOLVED: To allow a circuit not to discriminate occurrence of a fault before frequency of detection of a transient fault reaches a prescribed frequency of occurrence. SOLUTION: Every time a fault detection section 1 generates a fault detection signal, n-sets of timer circuits 3 to 5 provided in parallel are selected sequentially and cyclicly and then started in the fault monitor method, and an up-down counter 2 counts up fault detection signals while it is counted down every time each of the circuits 3 to 5 expires so as to detect a transient fault detection number as a fault detection frequency and a processing section 15 discriminates it to be occurrence of a fault when the count reaches the value (n). |
