Modular Fire Panel Planning | en 31
Bosch Sicherheitssysteme GmbH System Description F.01U.028.089 | 8.0 | 2011.07
3.3 Structures in Local Security Network
In a Local Security Network (LSN classic), fire detectors can be configured as a loop or as one
or two stubs.
In an improved version Local Security Network (LSN improved), the detectors can be
configured as a loop, a stub or T-tap or in any mixed loop or T-tap structures. However, it is
important to note that mesh structures cannot be created.
The LSN improved version allows T-taps on stubs or loops and any number of nodes, branches
per node and elements per branch as long as the maximum number of elements does not
exceed 254.
Connections can be positioned anywhere along the LSN line.
Table 3.2 Possible structures in LSN
When configuring the detectors, it is essential to ensure that no mesh structures are created.
Table 3.3 Unusable network structures
NOTICE!
Planning should take the anticipated total current and line resistance into account to ensure
each detector has an operating voltage of at least 15 V DC.
As soon as an LSN classic device is in a loop or stub, only loop or stub structures can be used.
In this case, T-tapping is no longer possible.
1: Loop 2: 1 or 2 stubs 3: T-tap
4: 1 or 2 stubs and T-taps
mixed
5: Loop and stubs mixed with
T-taps
Mesh structures within a stub structure Mesh structures within a loop structure
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