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Chapter 2 Overview| CME-DN01
2-2 Revision October 2007, 2006PDD23000003
2.3 Network Example
trunk line
Power
Supply
TR
TR: terminating resistor
: device node
TR
2.4 The Distance of Trunk Line
The distance between any two points must not exceed the maximum cable distance allowed for
the data. Refer to following table for details.
Data rate
Maximum
distance
(flat cable)
Maximum
distance
(thick cable)
Maximum
distance
(mid cable)
Maximum
distance
(thin cable)
125k bit/s 420m (1378 ft) 500m (1640 ft) 300m (984 ft) 100m (328 ft)
250k bit/s 200m (656 ft) 250m (820 ft) 250m (820 ft) 100m (328 ft)
500k bit/s 75m (246 ft) 100m (328 ft) 100m (328 ft) 100m (328 ft)
NOTE: Please refer to the "Appendix B -- DeviceNet Cable Profiles" in the DeviceNet
Specifications for the wiring cable to ensure the max. distance.
2.5 The Length of Drop Cable
A drop line connects a node on the DeviceNet cable system to the DeviceNet trunk. Refer to
following table for details.
Data Rates 125 Kbps 250 Kbps 500 Kbps
Maximum Drop Length 6 m (20 ft) 6 m (20 ft) 6 m (20 ft)
Cumulative Drop Budget 156 m (512 ft) 78 m (256 ft) 39 m (128 ft)