Rockwell Automation 20-COMM-ER 20-COMM-ER Dual-Port EtherNet/IP Communication Adapter User Manual User Manual
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Rockwell Automation Publication 20COMM-UM015B-EN-P - July 2013
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Glossary
configuration data and a fault occurs, the data from these parameters is sent as the
Logic Command, Reference, and/or Datalinks.
G
Gateway
A device on a network that connects an individual network to a system of
networks. When a node needs to communicate with a node on another network,
a gateway transfers the data between the two networks. You need to configure the
address for the gateway device in the adapter if you want the adapter to
communicate with devices that are not on its network.
H
Hardware Address
Each Ethernet device has a unique hardware address (sometimes called a MAC
address) that is 48 bits. The address appears as six digits separated by colons (for
example, xx:xx:xx:xx:xx:xx). Each digit has a value between 0 and 255 (0x00 and
0xFF). This address is assigned in the hardware and cannot be changed. It is
required to identify the device if you are using a BOOTP server.
HIM (Human Interface Module)
A device that can be used to configure and control a drive. PowerFlex 7-Class
HIMs (catalog number 20-HIM-xx) can be used to configure PowerFlex 7-Class
drives and their connected peripherals.
Hold Last
When communication is disrupted (for example, a cable is disconnected), the
adapter and PowerFlex drive can respond by holding last. Hold last results in the
drive receiving the last data received via the network connection before the
disruption. If the drive was running and using the Reference from the adapter, it
will continue to run at the same Reference.
I
Idle Action
An idle action determines how the adapter and connected drive act when the
controller is switched out of run mode.
I/O Data
I/O data, sometimes called ‘implicit messages’ or ‘input/output’, is time-critical
data such as a Logic Command and Reference. The terms ‘input’ and ‘output’ are
defined from the controller’s point of view. Output is produced by the controller
and consumed by the adapter. Input is produced by the adapter and consumed by
the controller.