Appendix G DeviceNet Physical Layer and Media
384 Adept MV Controller User’s Guide, Rev. B
This hot-pluggable feature is not fully supported. If you add
a new component to the network, you must make changes in the
*/7)8
program. Those changes are not active until you reboot
the Adept controller.
The power distribution on the network/bus does not need to be in one place. The
distribution of power supplies needs to be well planned since there are certain
constraints on the power supply. In general, power supplies can be placed at any
point in the network. The maximum current rating of a trunkline is 8 amps.
DeviceNet allows opto-isolated, externally powered devices (e.g., AC drive
starters and solenoid valves) to operate on the same bus cable. For detailed
information see the DeviceNet Technical Specifications or the Cutler Hammer
DeviceNet Installation Planning Guide. This document is available on the Internet at
the following address:
http://cutlerhammer.eaton.com/automation/whatsnew/index.html
from the menu item “DeviceNet Starter Kit”. The document is an Adobe Acrobat
PDF file. Adept supplies the Acrobat Reader program on its electronic
documentation CD-ROM.
The baud rate of the system depends on the length of the network (end-to-end)
and the type of cable. 94%$( shows how cable selection and trunkline length
affect the maximum data rate on the network. '$( shows a thick cable, and
'$(, a thin cable.
Table G-2. Features of a DeviceNet Network
Network Size A maximum of 64 nodes [0...63]
Network Length Selectable, end-to-end network distance varies with
speed
Baud Rate Distance (thick cable)
125 Kbps 500 m (1,640 ft.)
250 Kbps 250 m (820 ft.)
500 Kbps 100 m (328 ft.)
Data Packets 0-8 bytes
Bus Topology Linear (trunkline/dropline); power and signal on the
same network cable
Bus Addressing Multi-Master and Master/Slave special case; polled
System Features Removal and replacement of devices from the network
under power not supported by Adept
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