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6.6.3
Segment damping
The elementary requirement for a stable powerline connection is that there is no crosstalk
between adjacent segments at any time. For this reason, you should now carry out Crosstalk
measurement on all segments. For later documentation, it is advisable to save the
measurement results. If crosstalk occurs between segments, check again the cabling of both
segments involved in the measurement. In compliance with the cabling regulations, it should
always be possible to prevent crosstalk in typical systems with standard configuration.
The only alternative way to minimize a crosstalk is to reduce the signal levels of the entire
system, but this can lead to limitations of the maximum quantity structure.
6.6.4
Cycle times and level values
In the next step you should check the cycle times and level values. This can be done either
at a standstill with as many slaves as possible in the segment or in travel operation.
Observe the values in the Cycle time (Page 104) and Signal amplification and transmission
quality (Page 106) tables. The measured values of the cycle times should be similar in all
segments as well as to all slaves. Only the slave at "Poll order" 1 can/should have slightly
higher values depending on the system. If the measured values of one slave differ from
those of the others (longer cycle time, more timeouts, etc.), please check this slave for faults,
for example, its cabling.
In the signal quality table you will notice that the values of the slaves deteriorate with the
distance to the master. However, if you sort the table via the "Connected to" column or via
the "Position" column, if available, you can also identify outliers against the other slaves
here.
6.6.5
Frequency spectrum used
Drive as many vehicles as possible in the segment to be measured. Perform a Tone Map
(Page 109) measurement on the slaves that are close to the master. The majority of carriers
(apart from the deactivated ones) should be 6 bits/carrier.
In the second step you perform the measurement on the slave that is furthest away from the
master. Here the connection is clearly worse due to the damping by the vehicles and route.
However, only 10-20% of all carriers may have 0 bits/carrier (apart from the deactivated
ones).
If this is not the case and you cannot find any fault in the cabling, for example, you have to
either increase the level in the system (then do another Crosstalk measurement (Page 116))
or reduce the number of vehicles for a stable operation.
In addition, you can also perform an SNR (Page 111) and PSD measurement (Page 110) on
the slaves at the master and segment end.
Power Line Booster
Operating Instructions, 11/2019, A5E36203125A-AG
System configuration and system status (web interface)
6.6 Commissioning sequence
121
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