User`s guide

Chapter 7: Adept DeviceNet
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 trunk lines and drop
lines made of thick or thin cable. The baud rate, maximum distance from end-to-end of the net-
work, and cable size are dependent on each other. See the table Features of a DeviceNet Net-
work on page 87 for further details.
Figure 7-1. Trunk Lines and Drop Lines 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.
NOTE:This hot-pluggable feature requires the configuration of the controller to
match the configuration of the physical network. The default configuration auto-
matically recognizes and maps the first 64 bits of Mac ID 1 and 2. If the con-
figuration needs to be changed, use Adept ACE Configuration Tools.
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 because 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 trunk line 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.
Adept SmartController EX User’s Guide, Rev. D
Page 86 of 94