Rockwell Automation 20-COMM-S RS-485 DF1 Adapter - Manual (Page 55)

Glossary-5
Ping
A ping is a message that is sent by a DPI product to its peripheral
devices. They use the ping to gather data about the product, including
whether it can receive messages and whether they can log in for control.
PowerFlex 7-Class Drives
The Allen-Bradley PowerFlex 7-Class family of drives include the
PowerFlex 70 and PowerFlex 700. These drives can be used for
applications ranging from 0.37 kW (0.5 HP) to 3,000 kW (4,000 HP).
All PowerFlex 7-Class drives implement DPI, allowing them to use the
20-COMM-S RS-485 DF1 adapter.
Programmable Controller
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 central
processor, input/output interface, and memory. A controller is designed
as an industrial control system.
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.
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.