92 NFS2-640/E Programming Manual — P/N 52742:L2 7/17/14
Appendix B: Special Zone Outputs
B.1 Presignal and Positive Alarm Sequence (PAS)
B.1.1 What is Presignal and PAS?
Purpose
Presignal is a feature that initially causes alarm signals to only sound in specific areas, monitored
by qualified persons. This allows delay of the alarm up to 180 seconds after the start of alarm
processing. The control panel Presignal feature provides two selections:
•A Presignal Delay Timer (60-180 seconds) that delays activation of all outputs with a CBE
that includes Special Zone F0.
•A PAS (Positive Alarm Sequence) selection, in addition to the Presignal Delay Timer, that
allows a 15-second time period for acknowledging an alarm signal from a fire
detection/initiating device. If the alarm is not acknowledged within 15 seconds, all local and
remote outputs activate immediately and automatically.
An illustration of Presignal and PAS timing.
Figure B.1 Presignal and PAS Time
The control panel delays activation of outputs containing F0 in their Control-By-Event (CBE) list
for all alarm initiating devices that contain F0 in their CBE list. A subsequent alarm will abort the
Presignal Delay Timer and execute CBE lists.
Notes on using F0
• NFPA 72 requires installation of a PAS Inhibit switch, that can be used to turn off the PAS
delay timer when the control panel is unattended. Do so by programming a monitor module
with the Type Code,
PAS INHIBIT. For details, refer to “Modify or Delete a Point (2=point)”
on page 19.
• The Presignal Delay timer countdown can be stopped by pressing the
SYSTEM RESET key
before the Presignal Delay Timer expires.
• Program zone F0 to participating inputs and outputs that have appropriate CBE zone map
entries.
• Outputs must be programmed for resound by fire.
Restrictions on using F0
• Do not include F0 in the CBE list for a releasing device.
• Do not include F0 in the CBE list for any monitor module that connects to a device other
than an automatic fire detector.
Initial alarm
annunciation
Alarm activates outputs, if the
control panel is not reset
If PAS=Y, alarm activates
outputs if not acknowledged
Presignal Delay Timer (60-180 s)
PAS (15 s)
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