Rockwell Automation 20-COMM-P Profibus Adapter - Manual (Page 109)

Glossary-5
PowerFlex Drives
The Allen-Bradley PowerFlex family of drives includes PowerFlex 70,
PowerFlex 700, and PowerFlex 7000 drives. These drives can be used
for applications ranging from 0.37 kW (0.5 HP) to 3,000 kW (4,000 HP).
All PowerFlex drives implement DPI, allowing them to use the
20-COMM-P PROFIBUS adapter. This manual focuses on using the
adapter with PowerFlex drives. Other products that implement DPI can
also use the adapter.
PROFIBUS Network
A PROFIBUS network uses RS485 to connect devices (for example,
controllers, drives, and motor starters). A PROFIBUS network can
support a maximum of 126 devices. Each device is assigned a unique
node address and transmits data on the network at the same data rate.
A cable is used to connect devices on the network. It contains the bus
signal. Devices can be connected to the network in a daisy chain
connection.
General information about PROFIBUS and the PROFIBUS specification
are maintained by the PROFIBUS Trade Organization (PTO). PTO is
online at http://www.profibus.com.
R Reference/Feedback
The Reference is used to send a Reference (for example, speed,
frequency, torque) to the product. It consists of one word of input to the
adapter from the network. The size of the word (either a 16-bit word or
32-bit word) is determined by the drive.
Feedback is used to monitor the speed of a product. It consists of one
word of output from the adapter to the network. The size of the word
(either a 16-bit word or 32-bit word) is determined by the drive.
S 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.
A scanner is often called Master.
Status Indicators
Status indicators are LEDs that are used to report the status of the
adapter, network, and drive. They are on the adapter and can be viewed
on the front cover of the drive when the drive is powered.
20COMM-UM006A-EN-P.book Page 5 Friday, September 28, 2001 10:43 AM