Behavior In Degraded Mode - Siemens FDCI221 Technical Manual

Structure and function
3
Function

3.4.6 Behavior in degraded mode

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Building Technologies
Fire Safety
Applicable for the FDnet/C-NET:
When the main processor of the fire control panel fails, the control panel works 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.
Behavior in degraded mode on control panels supporting degraded
operation
Alarming is still ensured in degraded mode operation. However, in degraded
mode 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
module triggering the alarm.
If the output is being used for control (e.g., fire controls), it will take on the
configured fail-safe position in the event of a communication failure or current-
free detector line.
If the output is being used for controlling sounders or other evacuation devices
and degraded mode has been configured correctly, the output will respond to
the "Degraded mode horn" signal in the same way as other sounders on the
detector line.
Degraded mode operation on the FDnet/C-NET 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.
A6V10211122_m_en_--
2018-09-18