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Plant planning
3.4 System limits
3.4
System limits
3.4.1
Segment length
Plan the length of the communication segment so that it does not exceed the maximum
permitted segment length of 250 meters.
You must also ensure that the maximum number of permitted vehicles in the segment is
never exceeded during operation (see the Maximum number of stations (Page 40)).
You can maintain this, for example, by selecting the segment length in such a way that no
more than the permissible number of vehicles can fit into the communication segment.
3.4.2
Maximum number of stations
You can only achieve the maximum number of stations in PSS as well as in PDS
applications when you strictly adhere to all installation rules (cabling and positioning) and
when you use PLB connection cables that are shorter than or equal to 1 meter.
The logical high limit of slaves that can be managed by a PLB master is 50. In case of real-
time requirements, however, we recommend that you stay below this number. We will
therefore only look at the maximum number recommended for real-time applications.
The rules for determining the maximum configuration limit are listed below. Note that the
reductions per segment in percentage always apply in addition to the maximum
configuration.
PLB connection cable ≤ 1 meter long
For connection cables ≤ 1 meter, a maximum of 40 vehicles are possible for PSS
applications with one PLB slave per vehicle.
In PDS applications with uninterruptible communication, the maximum number of vehicles in
a segment is 20. Two PLB slaves are mounted on each of these vehicles so that the total of
slaves in the segment is also 40.
PLB connection cable 8 meters long
Through the attenuation and the poles of the 8 meter cables (Page 33) connected to the rail
as spur line, the maximum number of PLBs per segment is reduced by 40% of the maximum
configuration. This means a maximum of 24 vehicles are possible for PSS applications with
one slave each. In PDS applications with uninterruptible communication, the maximum
number of vehicles in a segment is then 12. Two PLB slaves are mounted on each of these
vehicles so that the total of slaves in the segment is also 24.
40
Operating Instructions, 11/2019, A5E36203125A-AG
Power Line Booster
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