5.4 C-NET detector line
24 V DC
Automatic fire detectors
Up to 252 line devices, such as automatic fire detectors, manual call points,
transponders, and other C-NET devices can be connected to one C-NET detector
The C-NET connection is on the periphery board.
Depending on the control panel type (2 or 4 loops), 252 or 504 line devices can be
operated on a station.
Most C-NET line devices, such as fire detectors, are supplied with the operating
voltage required directly by the C-NET. An external power supply is always needed
for the FDCIO223 transponder.
24 V DC
Figure 9: C-NET loop with various line devices
Loop extension (C-NET)
The number of C-NET detector lines can be doubled. The loop extension (C-NET)
which is fitted on the periphery board is needed for this purpose.
The maximum number of addressable line devices per station remains limited to
252 or 504.
The loop extension (C-NET) has no electrical isolation between the two loops.
All C-NET devices have an integrated line separator. In the event of a fault, e.g. a
short-circuit or wire break in the C-NET detector line, the line separator is opened
and the C-NET detector line segment in which the fault was found is shut down.
The C-NET devices remain functional and ready to detect. The fault is displayed on
C-NET detector line
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