Structure and function
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Building Technologies A6V10209291_f_en_--
Fire Safety & Security Products 05.02.2010
3.3.11 Behavior in degraded mode
Applicable for the FDnet:
If the main processor of the fire control panel fails, the control panel enters
degraded mode operation. Depending on the control panel, the fire control panel
may continue to provide the main alarming functions and signaling functions in
degraded mode operation.
Degraded mode operation behavior on control panels that support degraded mode
operation:
Alarming is still ensured in degraded mode operation. However, in degraded
mode operation, only collective alarming is possible. This means that in the
event of an alarm, it is possible to identify the detector line but not the exact
location of the detector triggering the alarm.
If a sounder base is connected to the output for the external alarm indicator, it
is activated in degraded mode operation if there is a fire alarm (only with
detectors and sounder bases with ES ≥ 30). Configuration for a specific control
panel is possible.
When the connection for the external alarm indicator is used for a control
function (e.g. hold-open system), the output assumes the configured fail-safe
position; configuration for a specific control panel is possible.
In degraded mode operation, the FDOOTC241 only supports the 'Fire' alarm
class. If the 'CO' alarm class is also to be supported in degraded mode operation,
technical customer support should be informed.
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.
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