Clarification of the Operation of Alarm Annunciators in an E2 Control System
Document Part # 026-4214 Rev 1 08-JUN-2012 Page 5 of 8
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technical bulletin
Because of this behavior, there may be differences between the annunciator log and the
non-annunciators advisory logs in cases where the annunciator has been offline for a long
time or if a new E2 has just been assigned as the annunciator. A Clear All Advisories opera-
tion on all E2 units is the only way to resolve annunciator synchronization problems.
Time of Reporting
An advisory may take up to 10 minutes between the time the advisory is generated and the
time it appears in the annunciator log. However, the advisory that appears in the advisory
log will always have the same time & date stamps as the original advisory. In other words, the
times shown for all advisories in the annunciator log are the times the advisories occurred,
not the times they were reported or received by the annunciator log.
Return to Normals
When an advisory that was reported to an annunciator returns to normal, the advisory status
will be changed to reflect this in both the annunciator log and the advisory log of the E2 from
which the advisory originated. Return-to-normals operate the same as advisory reports: the
originating E2 will attempt to send the update to the annunciator three times with a three-
minute pause in between retries, and if unsuccessful, it will not attempt further. It is there-
fore possible in an annunciator that has been offline for a long period of time to show adviso-
ries as active that are really no longer active.
Acknowledging, Resetting, and Clearing Advisories with Annunciators
An active advisory may be acknowledged, reset, or cleared from either the non-annunciator
E2 they originated from or from the alarm annunciator. With a few exceptions, any actions
performed on advisories in the non-annunciators advisory log will be reflected in the annun-
ciator log, and any actions requested in the annunciator log will be performed on the non-
annunciator E2.
In order to acknowledge, reset, or clear an alarm, you must be logged into the E2 with an
access level high enough to perform the action (usually level 3, although depending on the
user access settings the required level may be higher or lower).
Acknowledging Advisories
From the alarm annunciator, any advisories from non-annunciator units may be acknowl-
edged from the annunciator log screen. Likewise, if an advisory has been reported to the
alarm annunciator, an acknowledgement from the front panel of a non-annunciator will also
cause the advisory to be shown as acknowledged in the alarm annunciator. In either case,
the acknowledged advisory will be silenced in the E2 from which it originated, and the
alarm outputs and flashing *ALARM* icon in the E2 displays of both units will be de-ener-
gized (i.e. to their non-alarm state) if the acknowledged advisories were the only ones caus-
ing the output(s) to be energized.
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