Rockwell Automation 20G PowerFlex 755 Drive Embedded EtherNet/IP Adapter User Manual
Page 181
Rockwell Automation Publication 750COM-UM001E-EN-P - October 2013
181
Glossary
Master-Slave Hierarchy
An adapter configured for a master-slave hierarchy exchanges data with the
master device. Usually, a network has one scanner which is the master device, and
all other devices (for example, drives connected to EtherNet/IP adapters) are
slave devices.
On a network with multiple scanners (called a multi-master hierarchy), each slave
device must have a scanner specified as a master.
NVS (Nonvolatile Storage)
NVS is the permanent memory of a device. Devices such as the adapter and drive
store parameters and other information in NVS so that they are not lost when the
device loses power. NVS is sometimes called ‘EEPROM’.
PCCC (Programmable Controller
Communications Command)
PCCC is the protocol used by some controllers to communicate with devices on
a network. Some software products (for example, DriveExplorer software and
DriveExecutive software) also use PCCC to communicate.
Peer-to-Peer Hierarchy
An adapter that is configured for a peer-to-peer hierarchy can exchange data with
a device on the network that is not a scanner. This type of hierarchy can be set up
so that a scanner configures or transmits data to one PowerFlex 750-Series drive
which then sends the same configuration or data to other PowerFlex 750-Series
drives on the network. To use a peer-to-peer hierarchy, you configure one adapter
to transmit data and one or more adapters to receive the data.
Ping
A message that is sent on the network to determine if a node exists.
PowerFlex 755 (Architecture Class)
Drives
The Allen-Bradley PowerFlex 755 drives are part of the PowerFlex 750-Series of
drives.
Reference/Feedback
The Reference is used to send a setpoint (for example, speed, frequency, and
torque) to the drive. It consists of one 32-bit word of output to the adapter from
the network.
Feedback is used to monitor the speed of the drive. It consists of one 32-bit word
of input from the adapter to the network.
RSLogix 5000 Software
RSLogix software is a tool for configuring and monitoring controllers to
communicate with connected devices. It is a 32-bit application that runs on
various Windows operating systems. Information about RSLogix software can be
found at
. See also Studio 5000
environment.
Scanner
A scanner is a separate module (of a multi-module controller) or a built-in
component (of a single-module controller) that provides communication with
adapters connected to a network. See also Controller.
Status Indicators
LEDs that are used to report the status of the adapter, network, and drive. The
status indicators for the adapter can be viewed on the front cover of the drive
when the drive is powered.