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Structure and function
Function
3
17
Building Technologies
A6V10320090_c_en_--
Fire Safety
02.11.2011
The LEDs have a set flashing frequency of about 0.8 Hz and can be used as fol-
lows:
Configuration of LEDs Description
Activation with both
escalation levels
(default)
The LEDs also flash whenever the interbase is active.
Activation with
2nd escalation level
(evacuation) only
The LEDs only flash when 'Evacuation' is configured.
Activation with
degraded fire alarm
only
The LEDs are only activated with a degraded fire alarm.
Switched off
LEDs are never activated, i.e. the FDSB229 behaves like
a FDSB221.
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.
3.5.3
Behavior in degraded mode
Applicable for the FDnet:
When the main processor of the fire control panel fails, the control panel is in
degraded mode operation. Depending on the control panel type, the fire control
panel can continue to perform the most important alarming and signaling functions
in degraded mode operation.
The sounder interbase FDSB221 and the sounder beacon interbase FDSB229 are
also activated and deactivated in degraded mode operation in the event of a fire
alarm.
Degraded mode operation on the FDnet is not supported in the same way by all
control panels. The information in the 'List of compatibility' and in the corresponding
control panel documentation must be taken into account during project planning.