Rockwell Automation 20-COMM-I Interbus Adapter - Manual (Page 110)

Glossary-5
PODD
Process Output Data Description words are used for mapping output data
on the network. Example output data includes Logic Command,
Reference, and Datalinks (Datalink x1 In).
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.
Z Zero Data
When communications are disrupted (for example, a cable is
disconnected), the adapter and drive can respond with zero data. Zero
data results in the drive receiving zero as values for command data. If the
drive was running and using the Reference from the adapter, it will stay
running but at zero Reference.
20COMM-UM007A-EN-P.book Page 5 Tuesday, January 22, 2002 10:52 AM