Rockwell Automation 20G PowerFlex 755 Drive Embedded EtherNet/IP Adapter User Manual
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Rockwell Automation Publication 750COM-UM001E-EN-P - October 2013
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Glossary
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
.
Explicit Messaging
Explicit messages are used to transfer data that does not require continuous
updates. They are typically used to configure, monitor, and diagnose devices over
the network.
Fault Action
A fault action determines how the adapter and connected drive act when a
communication fault (for example, a disconnected cable) occurs or when the
controller is switched out of run mode. The former uses a communication fault
action, and the latter uses an idle fault action.
Fault Configuration
When communication is disrupted (for example, a cable is disconnected), the
adapter and its PowerFlex 750-Series drive can respond with a user-defined fault
configuration. The user sets the data that is sent to the drive using specific fault
configuration parameters in the adapter. When a fault action parameter is set to
use the fault configuration data and a fault occurs, the data from these parameters
is sent as the Logic Command, Reference, and/or Datalinks.
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.
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 or DHCP server.
HIM (Human Interface Module)
A device that can be used to configure and control a drive. The PowerFlex 20-
HIM-A6 or 20-HIM-C6S HIM can be used to configure PowerFlex 750-Series
drives and their connected peripherals.
Hold Last
When communication is disrupted (for example, a cable is disconnected), the
adapter and its 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.