NFS2-3030 Operations Manual — P/N 52546:N1 06/20//2014 25
Fire Alarm Event Operation of the Control Panel
2.1.2 Acknowledging an Event
When the panel detects an off-normal event and the information is displayed on-screen, one of the
soft keys displayed on the screen is ACKNOWLEDGE. Use this key to respond to new alarm or trou-
ble signals. When this key is pressed, the control panel does the following:
• It silences the piezo sounder on the panel if it is enabled
• It transfers the event to the history buffer
• If the panel is networked, it will send a network message.
There are two types of acknowledge; point and block. Point acknowledge is for fire alarms: fire
alarms are acknowledged one at a time when the Acknowledge soft key is pressed. Block acknowl-
edge is for all other types of off-normal events: these events are acknowledged all at the same time,
with a single stroke to the Acknowledge soft key.
2.2 Fire Alarm Event
2.2.1 How the Control Panel Indicates a Fire Alarm
When an initiating device (detector or monitor module) activates, the control panel does the follow-
ing:
• Produces a steady audible tone (if the piezo is enabled)
• Activates the System Alarm relay (TB4). It will also activate the Security (TB1) and
Supervisory (TB2) relays if their switches have been configured for alarm
• Flashes the
FIRE ALARM LED
•Displays
FIRE ALARM in the upper left corner of the display, a Type Code that indicates the type
of device that activated the fire alarm, and other information specific to the device. The
message occupies the top four lines of the screen, replacing the System Normal message as
shown in Figure 2.2 below. Refer to “Point Events Format” on page 14 for a full description of
each message field
• Sends an Alarm message to the History buffer and installed printer and annunciators
• Latches the control panel in alarm. (You cannot return the control panel to normal operation
until you correct the alarm condition and reset the control panel)
• Initiates any Control-By-Event actions
• Starts timers (such as Silence Inhibit, Auto Silence)
• Activates the general alarm zone (Z000)
NOTE: If Local Control is disabled, acknowledgements can not be made by pressing the
ACKNOWLEDGE soft key on the panel display. Events must be acknowledged from a
preprogrammed remote location. When DCC (Display and Control Center) participation is
enabled, panel acknowledgement can be performed when it is the DCC. When it is not,
permission must be granted from the DCC before the panel can make an acknowledgement.
Pressing the ACKNOWLEDGE soft key will automatically request permission from the DCC.
NOTE: If the panel is programmed for Receive Mode, events and the clearing of events must be
handled one at a time: each event must be acknowledged, and each clear (whether the clear
occurs automatically or as the result of a panel reset) must be acknowledged.
NOTE: If a monitor module programmed with a WATERFLOW Type Code initiates a fire alarm, the
control panel disables the SIGNAL SILENCE key and the Auto Silence Timer.
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