Discovering Association Rules of Mode-Dependent Alarms From Alarm and Event Logs

State-based or condition-based alarming has emerged as a prevalent method to reduce nuisance alarms and inhibit alarm floods in the alarm management of process industries. Such a strategy minimizes the number of active alarms by modifying alarm attributes or suppression status based on certain conditions. However, the configuration of state-based alarms in practice relies on process knowledge, making it time and resource intensive. In order to identify associations between alarms and states, this paper proposes a completely automated data-driven method to detect mode-dependent alarms from alarm and event (A&E) logs, where the messages of alarms and operating modes are stored. Algorithms to detect frequent patterns of operating modes and association rules of mode-dependent alarms are proposed. The effectiveness and applicability of the proposed method are demonstrated by case studies involving real industrial A&E data sets.