Rockwell Automation 20-COMM-M Modbus/TCP Adapter User Manual
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G-2
Glossary
20-COMM-M Modbus/TCP Adapter User Manual
Publication 20COMM-UM014C-EN-P
Datalinks
A Datalink is a type of pointer used by PowerFlex 7-Class drives to transfer
data to and from the controller. Datalinks allow specified parameters to be
read or written to without using explicit messages. When enabled, each
Datalink in a PowerFlex 7-Class drive consumes either four bytes or eight
bytes in both the input and output image table of the controller. The drive
determines the size of Datalinks.
DPI (Drive Peripheral Interface)
A second generation peripheral communication interface used by various
Allen-Bradley drives and power products, such as PowerFlex 7-Class
drives. It is a functional enhancement to SCANport.
DPI Peripheral
A device that provides an interface between DPI and a network or user.
Peripheral devices are also referred to as “adapters” or “modules.” The
20-COMM-M adapter, 1203-USB or 1203-SSS converter, and PowerFlex
7-Class HIMs (20-HIM-xxx) are examples of DPI peripherals.
DPI Product
A device that uses the DPI communications interface to communicate with
one or more peripheral devices. For example, a motor drive such as a
PowerFlex 7-Class drive is a DPI product. In this manual, a DPI product is
also referred to as “drive” or “host.”
DriveExplorer Software
A tool for monitoring and configuring Allen-Bradley products and adapters.
It can be run on computers running various Microsoft Windows operating
systems. DriveExplorer (version 3.xx or higher) can be used to configure
this adapter and PowerFlex drives. Information about DriveExplorer
software and a free lite version can be accessed at
DriveTools SP Software
A software suite designed for running on various Microsoft Windows
operating systems. This software suite provides a family of tools, including
DriveExecutive, that you can use to program, monitor, control, troubleshoot,
and maintain Allen-Bradley products. DriveTools SP can be used with
PowerFlex drives. Information about DriveTools SP 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.