| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To realize a control loop diagnostic device which eliminates subjective factors and enables identification of the factors, when a control loop is not sound by data based on an objective event. <P>SOLUTION: A control loop diagnostic device performs control operation using a measurement signal of flow rate of the measurement fluid by inserting a control valve in a duct in which the measurement fluid flows, and performs diagnosis of the soundness of the control loop which controls the control valve by the control signal obtained by the operation. This device is provided with an input process means to acquire and hold the measurement signal, the control signal and the signal of open degree of the control valve as monitoring data; and a change trend monitoring means which reads the monitoring data from this input process means, and monitors combination of patterns of the change trend of each monitoring data. <P>COPYRIGHT: (C)2007,JPO&INPIT</p> |
