Appendix-I: Pas / Pre-Signal; Pas - Siemens FC901-U3 Installation, Operation And Maintenance Manual

APPENDIX-I: PAS / PRE-SIGNAL

PAS (Positive Alarm Sequence) and Pre-Signal features allow the user to delay the activation
of the audibles, strobes and other output devices when an initial alarm is detected. Output can
be interlocked by zones. When an initial alarm is detected, all outputs except remote devices
(off-premises devices like general relays and city tie) associated with PAS Zone (Zone
configured with PAS feature) will be activated immediately. When PAS delay timer elapses,
other remote devices will also be activated. The delay timers are configurable.

PAS

When an alarm causing device associated with a zone with PAS feature is initiated, the alarm
condition is reported on the panel. The activation of its related remote outputs (e.g. output
relays) are delayed for 15 seconds (PAS delay time) waiting for a manual acknowledgement
response.
If no response is received within 15 seconds, the panel proceeds to activate the associated
remote outputs. See Figure A.
If the alarm event is acknowledged during the PAS delay time, the programmable PAS
investigation time (60-180 seconds) is added to the PAS delay time before remote outputs are
activated. See Figure B.
However, if a 2nd alarm is initiated anytime during the PAS delay time or PAS investigation
time, the remote output devices are immediately activated. See Figure C.
Pressing the Reset button at anytime during the PAS sequence will initiate a reset condition
and restore the panel to stand-by state.
st
1 Alarm
Initiated
Remote
devices ON
Remote
devices OFF
Acknowledge
Remote
devices ON
Remote
devices OFF
Remote
devices ON
Remote
devices OFF
PAS
Delay
time
15s
Alarm
nd
2 Alarm
Initiated
Investigation time
64
Panel
Reset
Figure A
PAS Normal
Sequence
Figure B
When Ack
before PAS
delay time
Figure C
nd
When 2
Alarm is
Initiated