Abnormal irregularity cause identifying device, abnormal irregularity cause identifying method, and abnormal irregularity cause identifying program

An abnormal irregularity cause identifying method executed by a computer, the method comprising:

• reading, from a storage device storing pieces of process data continuously output by a plurality of sensors included in a production facility, the pieces of process data;
• calculating an abnormality degree representing an extent of an irregularity of process data of the pieces of process data that is read;
• and
• obtaining, for each of the pieces of process data output by the corresponding one of the plurality of sensors, degrees of satisfying of a cause by using the abnormality degree calculated in the step of calculating the abnormality degree by using causal relation information defining a combination of a causal relation between the cause and the irregularity of the process data output by each of the plurality of sensors in a hierarchical manner along time series, the irregularity appearing as an influence resulting from the cause, wherein
• the irregularity cause in the production facility is identified based on the abnormality degree satisfying the predetermined criterion,
• wherein a candidate for an operating condition of the production facility for suppressing the abnormal irregularity is previously stored, and
• the production facility is controlled based on the stored candidate obtained from the identified irregularity cause.

A non-transitory computer readable medium storing an abnormal irregularity cause identifying program causing a computer to perform:

• reading, from a storage device storing pieces of process data continuously output by a plurality of sensors included in a production facility, the pieces of process data;
• calculating an abnormality degree representing an extent of an irregularity of process data of the pieces of process data that is read;
• and
• obtaining, for each of the pieces of process data output by the corresponding one of the plurality of sensors, degrees of satisfaction of a cause by using the abnormality degree calculated in the step of calculating the abnormality degree by using causal relation information defining a combination of a causal relation between the cause and the irregularity of the process data output by each of the plurality of sensors in a hierarchical manner along time series, the irregularity appearing as an influence resulting from the cause, wherein
• the irregularity cause in the production facility is identified based on the abnormality degree satisfying the predetermined criterion,
• wherein a candidate for an operating condition of the production facility for suppressing the abnormal irregularity is previously stored, and
• the production facility is controlled based on the stored candidate obtained from the identified irregularity cause.