38
en | Planning
Modular fire panel
07.2020 | 12.0 | F.01U.028.089
System Information
Bosch Sicherheitssysteme GmbH
0
0
0
2
0
0
4
0
0
6
0
0
8
0
0
0
1
0
0
2
1
0
0
4
1
0
0
6
1
0
0
8
1
0
0
0
2
L [m]
0
5
2
0
4
2
0
3
2
0
2
2
0
1
2
0
0
2
0
9
1
0
8
1
0
7
1
0
6
1
0
5
1
0
4
1
0
3
1
0
2
1
0
1
1
0
0
1
0
9
0
8
0
7
0
6
0
5
0
4
0
3
0
2
0
1
0
A
m
1
A
m
3
A
m
4
A
m
7
,
0
A
m
2
A
m
5
,
2
A
m
5
A
m
0
1
A
m
0
2
A
m
5
,
7
A
m
5
6
2
,
0
A
m
5
7
3
,
0
A
m
5
,
0
A
m
5
,
1
N
a
b
c
d
Figure 3.3:
Diagram for determining the maximum achievable cable length: LSN improved elements with LSN 0300 A
L =
cable length in meters
N =
number of LSN improved elements
a =
1600 m limit
b =
bus dynamic limit
c =
maximum possible number of LSN improved elements = 254
d =
300 mA limit
3.8
Achievable Cable Length with LSN 1500 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 Safety Systems Designer 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 pages
Using the Diagram for LSN improved, page 39 and Using the Diagram
for LSN improved, page 39 can be used to make a quick estimate.
The following applies:
L = cable length to be calculated in [m]
U
0
= bus voltage at the connection terminals = 30 volt
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