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INM MTL SUM5 Rev 7
DRAFT - 09 June 2021 DRAFT - 09 June 2021
21.7.3 Audible Group
Any channel within the Annunciator can be assigned to any group and once assigned the “Groups”
function needs to be set using the drop-down menu provided against each group
For example if channel 1 to 8 have been assigned to “Group-1” and they are all part of the same
audible group the drop-down menu for Group-1 should be set to “Audible Group”
Once selected the Internal Audible or Common Relays should be set to follow the associated horn
group as required.
21.7.4 Ring back Audible Group
When using ISA R – Ring Back Sequence the associated LED slow ashes to indicate to the
operator that an alarm has returned to normal.
In addition to the visual prompt the annunciator can sound an audible to prompt the operator that
Reset can be pressed to clear the alarm.
Alarms set to alarm sequence ISA R (Ring Back) and a Group for example Group-7 can be set to a
RB (Ring Back) Audible Group using the drop down menu provided against Group 7.
Group 7 can be typically assigned to HNB Horn Relay B and an external horn differing in tone from
the integral audible can be used to identify that an alarm has returned to normal.
Grouping Example
The following steps identify how to set the Group, Group Type and assign the Group to Internal
Horn and Common Relays.
In the above example ALL channels have be set to “Group 1”
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