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Section 3 Installation
Cable Planning
The DeviceNet places restrictions on total cable length. Cable distance between two
points includes both trunk line cable length and drop line cable length that exists
between the two points. For information on trunk distance and drop length, refer to
Figure 5.
Table 53 lists the data rates for trunk distance and drop length.
Network Wiring
Designing the network wiring has an impact on the maximum allowable baud rate
and is an input to the network power system design. Accurate planning of network
wiring is necessary, as the total trunk length and the cumulative drop length (the
total length of all drop lines) must be controlled.
The following points are to be considered while designing network wiring:
• Network trunk lines can be designed with thick, thin, or combinations of thick
and thin cable according to the tables in the DeviceNet Specification.
Table 53. Data Rates for Trunk Distance and Drop Length
Data Rate Trunk Distance
Drop Length
Maximum
Cumulative
125 KB 500 m (1640 ft)
6 m (20 ft)
156 m (512 ft)
250 KB 250 m 78 m (256 ft)
500 KB 100 m 39 m (128 ft)
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