Rockwell Automation 20-COMM-K CANopen Adapter - Manual (Page 110)

G-2 Glossary
20-COMM-K CANopen Adapter User Manual
Publication 20COMM-UM012B-EN-P
ControlFLASH
An Allen-Bradley software tool that lets users electronically update
firmware on printed circuit boards.
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 Datalinks
A Datalink is a type of pointer used by PowerFlex 7-Class drives to transfer
data to and from the controller. Datalinks allow specified parameters to be
read or written to without using explicit messages. When enabled, each
Datalink in a PowerFlex 7-Class drive consumes either four bytes or eight
bytes in both the input and output image table of the controller. The drive
determines the size of Datalinks.
Data Rate
The data rate is the speed at which data is transferred on the CANopen
network. The available data rates depend on the type of cable and total cable
length used on the network:
Each device on a CANopen network must be set for the same data rate.
DPI (Drive Peripheral Interface)
A second generation peripheral communication interface used by various
Allen-Bradley drives and power products, such as PowerFlex 7-Class
drives. It is a functional enhancement to SCANport.
Baud Rate Maximum Cable Length
10 Kbps 5000 m (16,404 ft.)
20 Kbps 2500 m (8, 202 ft.)
50 Kbps 1000 m (3,280 ft.)
125 Kbps 500 m (1,640 ft.)
250 Kbps 250 m (820 ft.)
500 Kbps 100 m (328 ft.)
800 Kbps 50 m (164 ft.)
1 Mbps 25 m (82 ft.)