182 Rockwell Automation Publication 750COM-UM009A-EN-P - May 2017
Glossary
ControlFLASH A free software tool that is used to update the firmware of Allen-Bradley
products. ControlFLASH™ software is downloaded automatically when the
firmware revision file for the product being updated is downloaded from the
Allen-Bradley updates website to your computer. ControlFLASH version 13 is
not supported.
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. The functions include: 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.
Controller Hierarchy An interface that is configured for a Controller hierarchy exchanges data with
the Logix Controller. Usually, a network has one communication bridge,
which is the controlling device, and all other devices (for example, drives
connected to EtherNet/IP adapters) are I/O devices.
On a network with multiple controllers, each I/O device must have a
communication bridge that is linked to a specified controller.
Data Rate The speed at which data is transferred on the EtherNet/IP network. You can
set the interface to a data rate of 10 Mbps Full-Duplex, 10 Mbps half-duplex,
100 Mbps Full-Duplex, or 100 Mbps Half-Duplex. If the network switch or
link auto-negotiates the data rate, you can set the interface to detect the data
rate.
Datalinks A datalink is a type of pointer that is used by PowerFlex 755T drives to transfer
data to and from the controller. Datalinks allow specified parameter values to
be accessed or changed without using explicit messages. When enabled, each
32-bit datalink in a PowerFlex 755T drive consumes 4-bytes in the input image
and/or 4-bytes in the output image of the controller.
DHCP (Dynamic Host
Configuration Protocol)
DHCP lets the interface configure its network address dynamically at restart if
the network has a DHCP server. The DHCP server assigns the interface a
preconfigured IP address, a subnet mask, and a gateway address. Therefore, you
do not have to configure these with the parameters in the interface. DHCP can
make it easier to administer an Ethernet network. A free version of the
Rockwell Software BOOTP-DHCP server can be obtained at http://
www.rockwellautomation.com/global/relianceelectricdrives/bootp-
utility.page
DLR (Device Level Ring) Network A DLR network is a single-fault tolerant ring network that is intended for the
interconnection of automation devices. This topology is also implemented at
the device level. No additional switches are required.
DNS (Domain Name System) A hierarchical decentralized naming system for any resource that is connected
to the Internet or a private network. It associates various information with
domain names that are assigned to each of the participating entities.
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