Siemens RXB Series Basic Documentation page 23

Example 1
Distances
Example 2
Total length
For internal use only
Siemens
Building Technologies
N1
200 m
150 m
100 m
Distance between bus device
and bus supply max. 350 m.
Not allowed: N4 = 550 m
N2
N1 .. N4 Bus devices
Bus device N4, by adhering to the max. allowed distance of 700 m between bus
devices, cannot be integrated in the bus if bus device N3 is integrated with a loop
(instead of subline).
If a max. distance of 350 m is kept between the centralized bus supply PSU and
the bus device (without bus supply), the bus supply must be placed at location 150
m / 250 m on the line distance 400 m.
N1
200 m
100 m
N2
N1 .. N5 Bus devices
The allowed total length of 1000 m in the line is exceeded, if device N5 is
integrated in the bus at the given bus wiring.
KNX bus communications
Engineering notes
400 m
PSU
250 m
400 m
Distance between
bus devices max. 700 m.
Not allowed:
N1 to N4 = 900 m
N2 to N4 = 800 m
100 m
100 m
100 m
N3
N5
Total lenght
max. 1000 m,
exceeded by
N5
200 m
100 m
100 m
100 m
N3
CE1P3127en
2013-04-08
N4
N4
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