ABB FCAN-01 User Manual page 45

In addition to the cable resistance, the real resistance of the
connectors should be taken into account in voltage drop
calculation. The transmission resistance of one connector should
be 2.5...10 mohm.
The following table lists the maximum bus cable length for
different node numbers (n), when
minimum dominant value V
minimum differential input resistance R
requested differential input voltage V
minimum termination resistance R
Wire cross-
section
2
n = 32
[mm ]
0.25
0.5
0.75
Maximum length [m]
n = 64
200 170
360 310
550 470
*
Safety margin of 0.2
**
Safety margin of 0.1
= 1.5 V
diff.out.min
diff.min
th.max
= 118 ohm.
T.min
*
Maximum length [m]
n = 100 n = 32
150 230
270 420
410 640
= 20 kohm
= 1.0 V
n = 64 n = 100
200
360
550
Electrical installation
45
**
170
320
480