| 摘要 |
PROBLEM TO BE SOLVED: To provide a plant monitoring device capable of improving accuracy of plant state monitoring.SOLUTION: A plant monitoring device 100 comprises: a threshold value acquisition part 7; a determination part; and an alarm part 10. The threshold value acquisition part acquires in advance, a first threshold value indicating a first range of variation of first process values, and a second threshold value indicating a second value in which a variation range is wider than the first range, based on a value obtained by averaging variation of the first process values and a value indicating the variation. The determination part compares the first process values obtained in time series, and corresponding first threshold value and second threshold value, thereby determines whether or not, the first process values exceed one of the first threshold value and second threshold value. The alarm part outputs alarm information which contains at least information of a time point when, the first process values exceed one of the first threshold value and second threshold value, based on the determination result of the determination part.SELECTED DRAWING: Figure 2 |
