Rockwell Automation 20-COMM-P Profibus Adapter - Manual (Page 108)

Glossary-4
I I/O Data
I/O transmit time-critical data such as a Logic Command and Reference.
The terms “input” and “output” are defined from the scanner’s point of
view. Output is transmitted by the scanner and consumed by the adapter.
Input is transmitted by the adapter and consumed by the scanner.
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 Node Address
A PROFIBUS network can have as many as 126 devices connected to it.
Each device on the network must have a unique node address between 0
and 126.
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 Parameter Messaging
Parameter Messages are used to configure, monitor, and diagnose
devices over PROFIBUS.
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.
20COMM-UM006A-EN-P.book Page 4 Friday, September 28, 2001 10:43 AM