Siemens FDCW221 - Line Separator in the Radio Gateway FDCW221

Structure and function
Function
3
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Building Technologies
009865_m_en_
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Fire Safety
2015-11-06
3.10.4 Line separator in the radio gateway FDCW221
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 FDnet detector line. The rest of the detector
line remains serviceable. On a loop line all FDnet devices remain fully functional
after a simple error.
FDCL221 line separator
In terms of topology, the radio detectors logged onto the radio gateway are in a
stub. The stub branches off on the FDnet detector line between the FDCW221 and
the integrated line separator FDCL221 of the radio gateway (see figure below).
Figure 3: Topology of radio gateway on FDnet
Gateway Radio gateway housing M1 Radio detector 1 on stub
FDnet FDnet spring clips on radio gateway M2 Radio detector 2 on stub
The radio gateway may only be operated on a loop in the
FDnet
. Since the radio
gateway and connected radio detectors form a stub, this configuration must never
be used in stub operations. If it is, an impermissible 'stub-on-stub' topology will
result.