Connection factor (AK, RK, MK)
The number of connectable C-NET devices and the max. line length depend on the
connection factor of the terminated line devices. The maximum number of 126 C-
NET devices per loop and the max. length of line of 3300 m can be greatly reduced
depending on the type and volume of line devices used.
See also
1 Connectable C-NET devices [➙ 32]
1 Wiring principle behind C-NET devices [➙ 39]
1 C-NET topology and connection [➙ 36]
5.5 Connectable C-NET devices
The table below contains a list of all devices which can be connected to the C-NET
detector line. It also highlights which devices feature an alarm indicator (AI) and to
which an external alarm indicator (Ext. AI) or a sounder base (DBS720) can be
connected.
Device type Type Description ↑ AI Ext. AI DBS 720
Heat detector HI720
Heat detector for demanding
applications
X X X
HI722 Heat detector for standard applications X X X
Flame detector FDF241-9
Flame detector with three sensors for
demanding applications with many
deceptive phenomena
X X –
Smoke detector FDL241-9
Linear smoke detector for demanding
applications with many deceptive
phenomena
X X –
OP720
Optical smoke detector for standard
applications with few deceptive
phenomena
X X X
Multi-sensor
detector
OH720 Simple optical-thermal point detector X X X
OOH740
Optical-thermal multi-sensor fire
detector for demanding application
X X X
OOHC740
Optical-thermal multi-sensor fire
detector with CO measurement
X X X
OOH740-A9-Ex
2
Optical-thermal multi-sensor fire
detector with ambient supervision with
collective DualProtocol and FDnet/C-
NET. For areas at risk of explosion
X X X
Aspirating smoke
detector
FDA221
Aspirating smoke detector up to a
monitoring area of 500 m
2
X X X
FDA241
Aspirating smoke detector up to a
monitoring area of 800 m
2
X X X
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