Trunk Line And Drop Line Lengths - YASKAWA SI-N3 Installation Manual

9

Trunk Line and Drop Line Lengths

Refer to www.odva.org for more information regarding wiring DeviceNet networks.
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Trunk Line
The maximum allowable trunk line length depends on the type of cable used and the
network baud rate. The total cable length includes the length of the trunk and the sum of all
the drop lines.
Baud Rate (kbps)
125
250
500
To calculate the maximum total length for trunk lines of mixed thick and thin cables, use the
following formulas:
• 125 kbps: L + (5 x L
thick
• 250 kbps: L + (2.5 x L
thick
• 500 kbps: L + L
thick
u
Drop Line
The drop line is measured from the tap on the trunk line to the transceiver of the DeviceNet
node. The total cable length includes the length of the trunk and the sum of all the drop lines.
Baud Rate (kbps)
125
250
500
YASKAWA ELECTRIC TOBP C730600 84D YASKAWA AC Drive Option SI-N3 Installation Manual
Table 11 Trunk Line Cable Length
Thick Cable
500 m (1640 ft)
250 m (787 ft)
100 m (328 ft)
) ≤ 500 m (1640 ft)
thin
) ≤ 250 m (787 ft)
thin
≤ 100 m (328 ft)
thin
Table 12 Drop Line Cable Length
Maximum at Each Drop
9 Trunk Line and Drop Line Lengths
6 m (20 ft)
Thin Cable
100 m (328 ft)
100 m (328 ft)
100 m (328 ft)
Maximum Total
156 m (511 ft)
78 m (256 ft)
39 m (128 ft)
45