7-4 Mass Notification
FIREFINDER-XLS INSTALLATION, OPERATION AND MAINTENANCE MANUAL | CHAPTER 7
NOTIFICATION APPLIANCE CIRCUITS
There are four types of MNS outputs: Speaker zones (which include amplifiers and
ZIC circuits), NAC/strobe ZIC Circuits, Relays, and Pseudo Points.
Manual control of MNS must be configured for highest priority. Automatic MNS
events can be configured either above or below Fire Alarm events in priority. They
should be annunciated via audio channels that are configured for an MNS usage and
have a matching priority compared to the audio channels that annunciate the other
event types. For example, if there is a message associated with a Fire Event playing
on a speaker zone and an MNS1 event is initiated, the speaker group will automati-
cally switch over to the MNS1 message. Any speaker groups that were playing the
Fire event’s message but are not configured to play the MNS1 message will auto-
matically become silenced. If an MNS2 event was initiated instead of the MNS1
event, the group will continue to play the Fire message. It is the user’s responsibility
to configure speaker zones that annunciate both Fire and MNS events with the
correct priorities. An important consideration is described below in the MNS AND
RELEASING section.
This automatic controlling of Fire audibles in the presence of higher-priority MNS
events results in the following:
• Audible LED shows “Silenced” until the MNS is reset, because this LED repre-
sents Fire silence only, not system silence.
• Once an MNS message is silenced, the entire system becomes silent (i.e. the
Fire message does not resume).
• There is no ability to manually unsilence the Fire system until the MNS is reset.
NACs that are configured for use by the MNS and have devices other than speakers
on them are required to be non-silenceable. This is enforced by the Zeus program-
ming tool.
Notification appliances used in MNS applications differ in appearance from those
used in Fire applications. For example, the word “Fire” is displayed on notification
appliances used for Fire applications, but not those used for MNS applications.
MNS notification appliance circuits support zone coding.
If outputs are dedicated to Fire only:
If Fire outputs were activated by an event other than a Fire alarm or gas/emergency
(e.g. manual activation, or in response to an event with Supervisory priority or lower),
then they are not silenced.
Non-silenceable audible circuits would still play their Fire message even though the
system has higher-priority MNS events and the Audibles Silenced LED is on.
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