Structure and function
Function
3
22 | 42
Building Technologies
A6V10349616_i_en_--
Fire Safety
2019-01-18
3.3.5 Behavior in degraded mode
For the FDnet/C-NET and a FDnet-Ex/C-NET-Ex connected to the
FDnet/C-NET, the following applies:
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.
Behavior of control panels that support degraded mode 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 FDnet/C-NET detector line but not the exact
location of the detector triggering the alarm.
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.
3.3.6 Line tester
WARNING
Using the line tester FDUL221 during commissioning
Risk of explosion
●
Only operate the line tester FDUL221 in the area that is not at risk of
explosion.
●
If peripheral devices on an FDnet-Ex/C-NET-Ex detector line are to be read
into the line tester FDUL221, make sure there is a line adapter (Ex)
FDCL221-Ex between the line tester and the peripheral devices.
The line tester FDUL221, used in conjunction with the line adapter (Ex)
FDCL221-Ex, can identify and localize the following faults in the FDnet/C-NET and
FDnet-Ex/C-NET-Ex:
●
Wiring error
●
Open line
●
Short-circuit
In addition, the line tester recognizes the devices connected to the FDnet/C-NET
detector line and the FDnet-Ex/C-NET-Ex detector line.
You will find more information in document 008250.
See also
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