Rockwell Automation 25-COMM-E2P PowerFlex 25-COMM-E2P Dual-Port EtherNet/IP Adapter User Manual
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Rockwell Automation Publication 520COM-UM003A-EN-E - June 2013
Glossary
Data Rate
The speed at which data is transferred on the EtherNet/IP network. You can set
the adapter to a data rate of 10Mbps Full-Duplex, 10Mbps Half-Duplex,
100Mbps Full-Duplex, or 100Mbps 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 520-series drives to transfer
data to and from the controller. Datalinks allow specified parameter value(s) to
be accessed or changed without using explicit messages. When enabled, each 16-
bit Datalink in a PowerFlex 520-series drive consumes 4 bytes in the input image
table and/or 4 bytes in the output image table of the controller.
Device-level Ring (DLR)
An Ethernet topology that consist of multiple devices configured in a circle-style
connection, implemented at the device level, and with no additional switches
required.
DHCP (Dynamic Host
Configuration Protocol)
DHCP lets the option module configure itself dynamically at restart if the
network has a DHCP server. The DHCP server assigns the adapter a
preconfigured IP address, a subnet mask, and a gateway address; therefore, you do
not have to configure these using the parameters in the adapter. DHCP can make
it easier to administer an Ethernet network. A free version of the Rockwell
Software BOOTP-DHCP Server can be accessed at
.
Duplex
Duplex describes the mode of communication.
Full-duplex communications let a
device exchange data in both directions at the same time.
Half-duplex
communications let a device exchange data only in one direction at a time. The
duplex used by the adapter depends on the type of duplex that other network
devices, such as switches, support.
EDS (Electronic Data Sheet) Files
Simple text files that are used by network configuration tools to describe
products so that you can easily commission them on a network. EDS files
describe a product device type and revision. EDS files for many Allen-Bradley
products can be found at
.
EtherNet/IP Network
EtherNet/IP (Industrial Protocol) is an open producer-consumer
communication network based on the Ethernet standard (IEEE 802.3), TCP/IP,
UDP/IP, and CIP. Designed for industrial communications, both I/O and
explicit messages can be transmitted over the network. Each device is assigned a
unique IP address and transmits data on the network. The number of devices that
an EtherNet/IP network can support depends on the class of IP address. For
example, a network with a Class C IP address can have 254 nodes.
General information about EtherNet/IP and the EtherNet/IP specification are
maintained by the Open DeviceNet Vendor’s Association (ODVA). ODVA is
online at
.