Clarification of the Operation of Alarm Annunciators in an E2 Control System
Document Part # 026-4214 Rev 1 08-JUN-2012 Page 8 of 8
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4. If #3 does not result in a match, the E2 will remove the oldest advisory of any type (alarm,
notice, or failure) without regard to the advisorys status.
This can include high-priority
alarms or failures that are still active, in which case they will continue to be active in the
non-annunciator the advisory originated from, and it will not be reported again unless
reset or cleared from the non-annunciator.
In most cases, the above rules will ensure the annunciator log does not erase active, unac-
knowledged advisories, unless the advisory is filled with active advisories and the annuncia-
tor log has no other choice. This typically will not happen unless the annunciator has been
left unattended for a long period of time, and/or the annunciator log is being populated by a
large number of E2s with low Alarm Annunc priority filtering thresholds.
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