The ISA-18.2 / IEC 62682 Alarm Management Lifecycle
What is an Alarm? (per ISA-18.2 / IEC 62682)
An alarm is an audible and/or visible means of indicating - There must be an indication of the alarm. An alarm limit can be configured to generate control actions or log data without it being an alarm.
to the operator - The indication must be targeted to the operator to be an alarm, not to provide information to an engineer, maintenance technician, or manager.
an equipment malfunction, process deviation, or abnormal condition - The alarm must indicate a problem, not a normal process condition. (e.g., pump stopped ,valve closed).
requiring a timely response. - There must be a defined operator response to correct the condition and bring the process back to a desired (safe and/or productive) state. If the operator does not need to respond promptly, then the condition should not be an alarm.