| 摘要 |
<p>PURPOSE:To take a quick and proper measure against a trouble and to prevent the influence of the trouble by using such a circuit that decides a trouble of a comparator or an arithmetic controller after detecting that the control signal outputted from the arithmetic controller is kept at a level outside a prescribed range for a fixed period of time. CONSTITUTION:When the control signal supplied to an arithmetic controller abnormality detecting circuit 20 is kept at a level higher than that prescribed by a comparator 21 for a period of time longer than that set by a timer 22 or kept at a level lower than that prescribed by a comparator 23 for a period of time longer than that set by a timer 24, an abnormal signal is outputted via an OR element 25. Thus it is possible to detect the abnormality of an arithmetic controller 12 or a comparator 11. In such a way, the internal trouble can be quickly and surely detected with an operating device abnormality detector 14 and a controller.</p> |
