WEG CFW-11 Communications Manual page 12

The cable for the connection of the CAN_L and CAN_H signals must have a characteristic impedance of
approximately 120 Ohm, and a maximum propagation delay of 5ns/m. Other characteristics depend on the cable
length, which must be according to the next table.
Cable length (m)
The maximum number of devices connected to a single segment of the network is limited to 64. Repeaters can be
used for connecting a bigger number of devices.
0 ... 40
40 ... 300
300 ... 600
600 ... 1000
Resistance per meter
(mOhm/m)
70
<60
<40
<26
Conductor cross section
(mm2)
0.25 ... 0.34
0.34 ... 0.60
0.50 ... 0.60
0.75 ... 0.80