Monitoring diagnostic device and monitoring diagnostic method

摘要

An abnormality monitoring process milt (2) divides sensor data collected from a monitoring-target apparatus (8) into sensor data for each of a plurality of condition modes based on a condition-mode transition point detected by a condition-mode transition point detecting process unit (21), and sorts the divided sensor data into a plurality of groups. Next, for each condition mode and each group, each piece of sensor data is compared with past statistic data, thereby detecting an abnormality. A causal diagnosis process unit (3) diagnoses an abnormality cause using link models before and after an abnormality is detected built based on a correlation coefficient between two pieces of sensor data in each group.