80 NFS-640 Programming Manual P/N 51333:B 10/03/2003
Appendix B: Special Zone Outputs
Presignal and Positive Alarm Sequence (PAS)
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 23 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 72-1999 requires installation of a PAS Inhibit switch, that you can use 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 “How to Modify an Addressable
Monitor Module Point” on page 23.
• Abort circuit activates by pressing the
SIGNAL SILENCE key before the Presignal Delay Timer
expires.
• Program zone F0 to participating inputs and outputs that have appropriate CBE zone map
entries.
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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