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Every time an observation event takes place, the Alarm Trigger’s State of the channel refreshes
(if necessary). For example: Let’s suppose that the Alarm Trigger is in Idle state. Note, that an
alarm is not triggered immediately when a parameter level passes over threshold (above High
Threshold or under Low Threshold). If the parameter level becomes stable (within Thresholds) and
Alarm Trigger Time is not elapsed, then Alarm Trigger remains in Idle state. If Alarm Trigger Time
expires and the parameter level is still out of bounds, then Alarm Trigger changes its state to Active.
This causes predefined actions - Alarm Notifications (E-mail, SMS, SNMP trap) and Save a Log
Record. The state will not be immediately changed to Idle when the parameter stabilizes (within
Threshold levels), but will wait until ‘Alarm Release Time’ is elapsed. Meanwhile if the parameter
passes over again any Threshold, the Alarm Trigger will remain in Active state. If the parameter
remains within Threshold levels and Alarm Release Time expires, Alarm Trigger switches to Idle
state and again predefined actions are initiated (as when entering Active state).
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
If RDS Group has not been received for more than Alarm Trigger Time state is changed to
Active. If state is Active and Release Time has elapsed and the RDS Group is received state is
changed to Idle. If the RDS Group is received before the Release Time is elapsed state remains
Active.
