Rockwell Automation 20-COMM-ER 20-COMM-ER Dual-Port EtherNet/IP Communication Adapter User Manual - Manual (Page 222)

222 Rockwell Automation Publication 20COMM-UM015B-EN-P - July 2013
Glossary
updated is downloaded from the Allen-Bradley updates website to your
computer.
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.
D
Data Rate
The speed at which data is transferred on the EtherNet/IP network. You can set
the adapter to a data rate of 10 Mbps Full-Duplex, 10 Mbps Half-Duplex, 100
Mbps Full-Duplex, or 100 Mbps Half-Duplex. If another device on the network
sets or auto-negotiates the data rate, you can set the adapter to automatically
detect the data rate.
Datalinks
A Datalink is a type of pointer used by PowerFlex 7-Class drives and SMC
controllers 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 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.
Device Level Ring (DLR)
A protocol that allows multiported EtherNet device to be connected in a ring
topology, enabling broken ring connection detection and network
reconfirmation to linear topology.
DLR Announce Frame
Data frame sent by the ring supervisor in a ring network to announce transition
from linear to ring or ring to linear configuration.
DLR Beacon Frame
Data frame sent by the ring supervisor in a ring network used to lost connections
that break the ring.