6
Electrical installation
Bus cable length
3. Please compare the detected values.
If the value in Tab. 2 is smaller than the total cable length in Tab. 1, repeaters must be used.
Repeaters divide the total cable length into segments.
)
Note!
Please note the reduction of the total cable length due to the signal delay
ƒ
of the repeater (see example (^ 55).
Mixed operation
ƒ
– With mixed operation, different devices are connected to the same
mains.
– If the total cable lengths of the devices 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:
l
Number of devices
connected:
l
Repeater:
With maximum number of bus devices (63) the following cable lengths/number of
repeaters must be complied with:
Baud rate [kbits/s]
Max. cable length [m]
Segment cable length [m]
Number of repeaters
54
(according to cable specification ^ 48)
2
0.5 mm
63
Lenze repeater, type 2176 (cable reduction: 30 m)
20
50
3900
1500
310
310
13
5
l
125
250
610
270
310
270
1
−
EDK82ZAFCC−100 DE/EN/FR 6.0
500
1000
100
9
100
9
−
−