Patent ID: 8005646

Claim:
A plant alarm apparatus comprising: plant data input means for periodically taking in plant data from each of sensors arranged in a plant; a latest plant data value table for temporarily storing latest values of the plant data taken in by the plant data input means; plant data recording means for taking out the latest values of the data of the latest plant data value table and storing the latest values in a plant history data table as long term time series plant data; alarm-triggering value alteration means for updating points for detecting any plant abnormality in an alarm-triggering value registration table in response to a request made by an operator; alarm-triggering condition editing means for registering alarm-triggering conditions of at least one point showing a foretoken of abnormality in an alarm-triggering condition table when the plant falls into an abnormal condition, the alarm-triggering condition editing means determining the alarm-triggering conditions of the at least one point showing a foretoken of abnormality, the at least one point being different from an important point that directly shows an abnormality of the plant; deviation-from-limit-value determining means for reading the stored values of the alarm-triggering value registration table and the alarm-triggering condition table and comparing limit values of at least one point for detecting any abnormality of the plant and the alarm-triggering conditions with a latest plant data value; and alarm notification output means for outputting an outcome of the comparison to a display apparatus when the comparison by the deviation-from-limit-value determining means shows a deviation from a predetermined range.