page 35
Wire cross-sections
For the design of the CAN network the wire cross-section of the
bus cable used must be taken into account. The following table
describes the dependence of the wire cross-sections on the
number of the bus participants referred to a transmission rate of
1 Mbit/s and a maximum cable length of 40 m (cable resistance
r = 70 m
Ω
/m).
Cable length 32 bus nodes 64 bus nodes 100 bus nodes
100 m
0.25 mm2 0.25 mm2 0.25 mm2
250 m
0.34 mm2 0.50 mm2 0.50 mm2
500 m
0.75 mm2 0.75 mm2 1.00 mm2
Depending on the EMC requirements the bus cables can be laid
in parallel or as a twisted pair with or without screen.
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