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When an observation event takes place, the alarm trigger’s state will refresh, if necessary. Should
we consider an instance when the alarm trigger is in
Idle
state, having in mind that an alarm is
not triggered immediately when a parameter level passes beyond threshold: If the parameter level
becomes stable, within thresholds, and the alarm
Trigger time
is not elapsed, then the alarm trigger
remains in
Idle
state. If the alarm
Trigger time
expires and the parameter level is still beyond
limits, the
Alarm trigger
would change its state to
High/Low
. This would result in predefined
actions - alarm notifications (E-mail, SMS, SNMP trap) and save a log record. The state will not
be immediately switched into
Idle
when the parameter stabilizes, within threshold levels, not up
until the alarm
Release time
is elapsed. Meanwhile, if the parameter crosses again any threshold,
the
Alarm trigger
will remain in active state. If the parameter remain within the threshold levels
and the alarm
Release time
expires, then the
Alarm trigger
would switch into
Idle
state and again
predefined actions would be initiated.
LEVEL
Hi Threshold
TIME
Alarm Idle
No Alarm
Period < Alarm Trigger Time
Period > Alarm Trigger Time
Period > Alarm Release Time
Alarm Active
Alarm Idle
Alarm Idle
No Alarm
Notification
for Active Alarm
Notification
for Idle Alarm
