Structure and function
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Building Technologies 007004_k_en_--
Fire Safety & Security Products 16.04.2009
3.4.4 Line separator
All FDnet devices are equipped with a line separator.
The FDnet device is equipped with electronic switches which isolate the defective
part in case of a short-circuit on the detector line. The rest of the detector line
remains serviceable. On a loop line all FDnet devices remain fully functional after a
simple error.
3.4.5 Automatic recognition of the detector line protocol
The two multiple protocol detectors FDOOT241-9 and -8 may communicate via
different detector line protocols. These detectors recognize the protocol on the
detector line (e.g. FDnet or collective) and automatically switch to the protocol in
question. This functionality facilitates commissioning in case of modernization, as
no actions need to be taken on the detector itself. See document 008331 'List of
compatibility' for exceptions.
3.4.6 Internal alarm indicator
The detectors have an internal alarm indicator. The internal alarm indicator shows
the operating condition of the detector (see table).
Operating condition Flashing mode of the AI
Normal AI flashes weakly every 4 seconds
Test AI flashes weakly every 0.5 seconds
Alarm AI lights up every second
3.4.7 Connection of external alarm indicators
Two external alarm indicators can be connected to every detector. In the FDnet the
alarm indicator can be connected to any detector; activation of the alarm indicator
can be programmed in the control panel.
Instead of an optical alarm indicator that flashes in the event of an alarm, the
sounder base is provided with an acoustic alarm indicator.
See also
Connection diagram (addressed) [J 70]
Connection diagram (collective) [J 73]
Connection diagram (MS8) [J 76]
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