Electrical installation
Wiring of system bus (CAN)
84
EDBCSXS064 EN 4.0
Bus cable length
Note!
The permissible cable lengths must be observed.
1. Check the compliance with the total cable length in Tab. 5−1.
The baud rate determines the total cable length.
CAN baud rate
[kbit/s]
Max. bus length
[m]
50
1500
125
630
250
290
500
120
1000
25
Tab. 5−1
Total cable length
2. Check the compliance with the segment cable length in Tab. 5−2.
The segment cable length is determined by the cable cross−section used and the number
of nodes. Without a repeater, the segment cable length corresponds to the total cable
length.
Number of nodes
Cable cross−section
0.25 mm
2
0.5 mm
2
0.75 mm
2
1.0 mm
2
2
240 m
430 m
650 m
940 m
5
230 m
420 m
640 m
920 m
10
230 m
410 m
620 m
900 m
20
210 m
390 m
580 m
850 m
32
200 m
360 m
550 m
800 m
63
170 m
310 m
470 m
690 m
Tab. 5−2
Segment cable length
3. Compare the two values detected.
If the value detected from Tab. 5−2 is smaller than the total cable length to be provided
from Tab. 5−1 , repeaters must be used. Repeaters divide the total cable length into
segments.
