Siemens DBS721 Technical Manual page 19

Building Technologies
Fire Safety
Configuration of LEDs Description
Activation with both
alarm levels (default)
Activation only with
second alarm level
(evacuation)
Activation with
degraded fire alarm
only
Switched off
The degraded fire alarm is a fire alarm which occurs during degraded mode
operation of the fire control panel.
Degraded mode operation is a defined reduced operating mode which occurs
when part of the fire detection installation fails.
Sounder interbase with supplementary optical indication DBS729
The sounder interbase with supplementary optical indication DBS729 can be
activated for the following selectable alarm levels:
Warning (Alert)
Evacuation (EVAC)
The tone can be configured individually for each of the two selectable alarm levels
from 11 different tones and the sound level can be configured by device. There are
three sound levels available: One alarm sound level according to EN 54-3 and two
test sound levels.
The LEDs have a set flashing frequency of about 0.8 Hz and can be used as
follows:
Configuration of LEDs Description
Activation with both
alarm levels (default)
Activation only with
second alarm level
(evacuation)
Activation with
degraded fire alarm
only
Switched off
The degraded fire alarm is a fire alarm which occurs during degraded mode
operation of the fire control panel.
Degraded mode operation is a defined reduced operating mode which occurs
when part of the fire detection installation fails.
See also
2 Behavior in degraded mode [
The LEDs also flash whenever the interbase is active.
The LEDs only flash when the second alarm level is
activated.
The LEDs are only activated as an additional alarm signal
in the event of a degraded fire alarm.
LEDs are never activated, i.e. the DBS728 behaves like a
DBS721.
The LEDs also flash whenever the interbase is active.
The LEDs only flash when the second alarm level is
activated.
The LEDs are only activated as an additional indicator in
the event of a degraded fire alarm.
LEDs are never activated, i.e. the DBS729 behaves like a
DBS721.
Structure and function
Function
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2017-10-31
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