| 摘要 |
<p>PURPOSE:To present an abnormality detector for a control instrument which quickly and accurately detects the abnormality of the control instrument. CONSTITUTION:A deviation E between a set value SV of the control instrument and an actual state value PV is integrated, and an obtained integral value S is compared with a preliminarily set decided value D to detect the abnormality. Simultaneously, the stability against variance and the quickness of detection are secured by check of the change of the set value SV, check of the increase/ reduction of the deviation E, and comparison of an absolute value ¦E X S¦.</p> |
