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AVENAR panel
2 stubs with
branches
Table 3.6: Topologies in LSN improved with manual address setting (T-tap)
3.5
Failure handling in Local Security Network
Removal of LSN element
The removal of an LSN element also results in an open condition. During reinitialization the
application functionality of all elements is interrupted. Therefore, the automatic reinitialization
can affect the alarm timing of the devices.
Detector removal feature in T-tap topology
This feature ensures detector removal without affecting the alarm timing of other devices. The
feature is based on prevention of reinitialization due to detector removal. The feature is
available with LSN bus module firmware 1.0.55 and higher. In regions where local applicable
standards require this feature, proceed as follows:
–
–
Previously removed detectors can be reinserted back into their bases. After a reset of the LSN
line the detectors will be restored to their normal function.
In case of a short circuit condition or an open condition, a loop topology offers for each
unaffected LSN element an alternative way to keep up its application functionality. The LSN
loop will be split. One resulting stub is powered by LSN1, the other resulting stub is powered
by LSN2. The LSN line and the affected elements are in trouble status. An automatic
reinitialization starts.
Unlike for the loop topology, you will loose all application functionality behind the element
with short circuit or open condition in case of a stub or a branch.
Consider that the isolation function is limited if you use single-element branches on the LSN
line. In a single-element branch the isolator function of the LSN element is not used: The b
wires of the LSN line are only connected to one of the b connectors of the devices, e. g. b1.
The LSN element will be powered through the b1 connector, and the current powering the
remaining line is not passing through the element. The element thus does not act as an
isolator. Each two neighboring isolating elements define a zone, and all elements within the
zone will be affected in case of a short circuit fault within the zone. A short circuit will
interrupt the application functionality in the zone.
Bosch Sicherheitssysteme GmbH
LSN 0300 A
LSN 1500 A
Loop with branches
Detectors whose removal should not affect the alarm timing of other devices must
installed as the last elements of T-tap stubs: Connect both the incoming and outgoing
LSN b line to the b1 connector or connect both to the b2 connector. This will prevent a
loop interruption when the element is removed. Since, it also prevents the element to act
as an isolator, isolation must be ensured by the isolator in one of the other elements on
the loop. In case of a short circuit condition, all non-isolated elements between the two
isolating elements will be disconnected. The number of non-isolating elements between
two isolating elements must thus be limited in number according to local regulations.
Additionally, activate in FSP-5000-RPS under Network Settings the feature Detector
Removal Feature in T-Tap.
LSN 0300 A
LSN 0300 A
LSN 1500 A
LSN 1500 A
Loop with one-
element branches
System manual
Planning | en
2022-07 | 5.0 | F.01U.378.910
33
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