Rockwell Automation 20-COMM-I Interbus Adapter - Manual (Page 109)

Glossary-4
L Logic Command/Logic Status
The Logic Command is used to control the PowerFlex drive (e.g., start,
stop, direction). It consists of one 16-bit word of input to the adapter
from the network. The definitions of the bits in this word depend on the
drive.
The Logic Status is used to monitor the PowerFlex drive (for example,
operating state, motor direction). It consists of one 16-bit word of output
from the adapter to the network. The definitions of the bits in this word
depend on the drive.
M Master
See scanner.
N NVS (Non-Volatile Storage)
NVS is the permanent memory of a device. Devices such as the adapter
and drive store parameters and other information in NVS so that they are
not lost when the device loses power. NVS is sometimes called
“EEPROM.”
P Peripheral Communications Protocol (PCP) Messages
Acyclic messages that are typically used for configuration purposes such
as reading/writing parameters. PCP messages are explicit messages, i.e.
they must explicitly identify where the data is to be read from or written
to.
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 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-I Interbus adapter. This manual focuses on using the adapter
with PowerFlex drives. Other products that implement DPI can also use
the adapter.
PIDD
Process Input Data Description words are used for mapping input data
on the network. Example input data includes Logic Status, Feedback,
and Datalinks (Datalink x1 Out).
20COMM-UM007A-EN-P.book Page 4 Tuesday, January 22, 2002 10:52 AM