User guide

Electrical installation
Bus cable length
6
EDK82ZAFUC010 DE/EN/FR 4.0
59

H2 BusLeitgsLaenge−Leitungslaenge_3
3. Compare the two values determined.
If the value given in Tab. 2 is smaller than the required total cable length from Tab. 1,
repeaters must be used. Repeaters divide the total cable length into segments.
 Note!
ƒ Note the reduction of the total cable length due to the signal delay of the
repeater (see example
60).
ƒ Mixed operation
– There is mixed operation if different nodes are connected to the same
mains.
– If the total cable lengths of the nodes are different at the same baud
rate, the smaller value must be used to determine the max. cable
length.
Example: Selection help
Given:
l Cable cross−section:
0.5 mm
2
(according to cable specification 57)
l Number of nodes
connected:
100
l Repeater:
Lenze repeater, type 2176 (cable reduction: 30 m)
For the above selections the following cable lengths / number of repeaters must be
observed:
Baud rate [kbps] 10 20 50 125 250 500 1000
Max. cable length [m] 8000 3900 1500 630 290 120 25
Segment cable length [m] 270 270 270 270 290 120 25
Number of repeaters 33 16 6 2 − − −