Achievable Cable Length With Lsn 0300 A - Bosch FPA-5000 System Information Manual

28 en | Planning
Rotary switch setting
Table 3.3: Addressing via rotary switches
The rotary switches are moved to the required position using a slotted-head screwdriver.
Automatic Addressing
If addresses are automatically allocated by a fire panel with LSN improved version technology,
all detectors must have the address "0 0 0" (factory default setting).
Manual Addressing
With manual addressing, the detector address is set using the three rotary switches. The right-
hand rotary switch is used to set the units, the central rotary switch is used to set the tens
and the left-hand rotary switch is used to set the hundreds.
Notice!
Using addresses greater than 254 is not permitted.
This will prompt the display of an error message on the fire panel.
With manual addressing, all the detectors in a loop, stub or T-tap must have an address
between 1 and 254.
From the LSN module software version 1.0.35 onwards, you can operate LSN improved
elements and LSN classic elements in combination in a loop or stub. If an LSN classic element
is present, only 127 elements can be used in the loop.
Note that structures with T-tapping are only possible if only LSN improved elements are used
(see Structures in Local Security Network, page 25).
For setting addresses with DIP switches, refer to the instructions in the installation guide
supplied with the products.
3.5 Achievable Cable Length with LSN 0300 A
The usable cable length depends essentially on the resistance of the cable and the quantity
and current consumption of the network elements. The way in which the elements are
distributed locally on the bus also makes a difference.
The possible cable length can be estimated using the formula below. This formula is also used
in the Planning Software by Bosch for fire alarm systems and is based on the critical
application situation where all network elements are concentrated at the end of the bus line.
The calculated cable lengths are therefore on the conservative side. The diagrams on and can
be used to make a quick estimate.
The following applies:
L = cable length to be calculated in [m]
U
0
U
End
q = cable cross section = 0.503 mm
09.2017 | 11.3 | F.01U.028.089
= bus voltage at the connection terminals = 30 volt
= bus end voltage = 15 volt (must not fall below this limit!)
Address Operating mode
0 0 1 Loop/stub/T-tapping in LSN improved version mode
... with manual addressing (address shown in
2 5 4 example = 131)
CL 0 0 Loop/stub in LSN classic mode with automatic
addressing (T-tapping not possible, maximum
number of elements = 127)
2
(for cable Ø 0.8 mm)
System Information
Modular Fire Panel
Bosch Sicherheitssysteme GmbH