Glossary – Rockwell Automation 20-750-PNET Profinet Single Port Option Module User Manual
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Rockwell Automation Publication 750COM-UM006A-EN-P - January 2013
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Glossary
Acyclic Messaging
Profinet acyclic messages are used to transfer data that does not require
continuous updates. Typically the read and write services used for acyclic
messaging are used to configure, monitor, and diagnose devices over the Profinet
network.
Connected Components Workbench
Software
The recommended tool for monitoring and configuring Allen-Bradley products
and network communication adapters. It can be used on computers running
various Microsoft Windows operating systems. You can obtain a free copy of
Connected Components Workbench software at
ControlFLASH Software
A free software tool used to electronically update the firmware of Allen-Bradley
products and network communication adapters. ControlFLASH software is
downloaded automatically when the firmware revision file for the product being
updated is downloaded from the Allen-Bradley updates website to your
computer.
Controller
A controller, also called programmable logic controller, is a solid-state control
system that has a user-programmable memory for storage of instructions to
implement specific functions such as I/O control, logic, timing, counting, report
generation, communication, arithmetic, and data file manipulation. A controller
consists of a central processor, input/output interface, and memory. See also
Data Rate
The speed at which data is transferred on the Profinet network (fixed at 100
Mbps).
Datalinks
A Datalink is a type of pointer used by PowerFlex 750-Series drives to transfer
data to and from the controller. Datalinks allow specified parameter values to be
accessed or changed without using acyclic messages. When enabled, each 32-bit
Datalink in a PowerFlex 750-Series drive consumes 4 bytes in the input image
table and/or 4 bytes in the output image table of the controller.
DCP (Discovery
Configuration Protocol)
A communications protocol within the PROFINET standard which allows an
IO Controller or Supervisor to commission every PROFINET IO device on a
subnet.
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 option module a pre-
configured IP address, a subnet mask, and a gateway address; therefore, you do
not have to configure these using the parameters in the option module. DHCP
can make it easier to administer a Profinet network. A free version of the
Rockwell Software BOOTP-DHCP server can be obtained at
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.