Devicenet Physical Layer And Media - adept technology MV User Manual

Appendix G

DeviceNet Physical Layer and Media

The DeviceNet physical layer and media specifications are published in the
ODVA manual, chapter 9, volume 1. It describes possible topologies and
components of the physical layer of the DeviceNet.
'  
$(
shows several possible topologies. The DeviceNet specifications also
specify system grounding, mixing of thick and thin cable media, termination, and
power distribution.
The basic topology is the trunkline-dropline topology. This topology uses
separate twisted-pair buses for the distribution of signals and power. The
specifications allow trunklines and droplines made of thick or thin cable. The
baud rate, maximum distance from end-to-end of the network, and cable size are
dependent on each other. See 94%
$( .
Multiple
Node
Branching
Drop Line
Terminating
Resistor
Node
Zero Length Drop Line
Figure G-1. Trunklines and Droplines Made of Thick and Thin Cable
DeviceNet allows devices to be powered directly from the bus, and devices can
use the same cable to communicate with other devices on the bus. DeviceNet
nodes are hot-pluggable — you can remove or add components on the bus
without powering down the network.
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
Node Node
Multi-Port
Tap
Node
Drop Line
Node
Node
Tap
Node
Node
Adept MV Controller User's Guide, Rev. B

DeviceNet Physical Layer and Media

Trunk Line
Multi-Port
Tap
Node
Drop Line
Node
Short Drop Lines (6m/20ft)
Terminating
Resistor
Node
Multiple
Node Daisy
Chain Drop
Node
Line
Node
Node
383