Siemens FS20 - Line Topology

Plann
ing detector lines
Planning an FDnet detector line
7
68 | 242
Building Technologies
008843_v_en_
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Fire Safety
2015
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12
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15
Guidelines
● A maximum of 252 addresses can be operated per line card on one ↑ loop.
● The following restrictions apply if more then 126 devices are connected to a
loop (a maximum of 252 may be connected):
– Line separation is not supported
– Restricted loop length (see outline quantities tool FX2010 )
– Only up to 252 addresses are possible per line card
– Line testers with firmware V3.x and lower only support a maximum of 126
addresses
● It is also possible to connect two stubs instead of a loop and mixed variants are
possible.
According to EN
54, a maximum number of 32 detectors may fail in the event of a
fault.
7.1.4 Line topology
In the FDnet, the following topologies are admissible.
↑ Loop
↑ Stub
Sub-stubs on loop
Table 13: Permissible topologies
No other topologies are admitted. The 'Sub-stub on sub-stub' topology in particular
is not permitted.
Sub-stub on sub-stub with a loop
Sub-stub on stub
Table 14: Impermissible topologies