Rockwell Automation 20-COMM-Q ControlNet Adapter User Manual
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Glossary
20-COMM-C/Q ControlNet Adapter User Manual
Publication 20COMM-UM003F-EN-P
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 Scanner.
ControlNet Network
ControlNet is an open producer/consumer communication network with
features, such as redundant media and deterministic I/O timing, designed
for high-performance or time-critical requirements.
More information about ControlNet and the ControlNet specification is
available online at
.
D
Data Rate
The speed at which data is transferred on the ControlNet network (fixed at 5
Mbps).
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 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-C or 20-COMM-Q adapter, 1203-USB or 1203-SSS converter,
and PowerFlex 7-Class HIMs (catalog number 20-HIM-xxx) are examples
of DPI peripherals.
DPI Product
A device that uses the DPI communication 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’.