Rockwell-automation 22-COMM-D DeviceNet Adapter User Manual Page 126

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Glossary-2
Controller
A controller, also called programmable logic controller, is a solid-state
control system that has a user-programmable memory for storage of
instructions to implement specific functions such as I/O control, logic,
timing, counting, report generation, communication, arithmetic, and data
file manipulation. A controller consists of a central processor, input/
output interface, and memory. See also Scanner.
Cyclic I/O Data Exchange
A device configured for Cyclic I/O data exchange transmits data at a
user-configured interval. This type of exchange ensures that data is
updated at an appropriate rate for the application, preserves bandwidth
for rapidly-changing devices, and allows data to be sampled at precise
intervals for better determinism.
D Data Rate
The data rate is the speed at which data is transferred on the DeviceNet
network. The available data rates depend on the type of cable and total
cable length used on the network:
Each device on a DeviceNet network must be set for the same data rate.
You can set the DeviceNet adapter to 125 K, 250 K, or 500 K. You can
set it to Autobaud if another device on the network has set the data rate.
Maximum Cable Length
Cable 125 K 250 K 500 K
Thick Trunk Line 500 m (1,640 ft.) 250 m (820 ft.) 100 m (328 ft.)
Thin Trunk Line 100 m (328 ft.) 100 m (328 ft.) 100 m (328 ft.)
Maximum Drop Length 6 m (20 ft.) 6 m (20 ft.) 6 m (20 ft.)
Cumulative Drop Length 156 m (512 ft.) 78 m (256 ft.) 39 m (128 ft.)
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