Rockwell Automation 22-COMM-P PowerFlex Profibus Adapter User Manual
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Glossary-4
of input from the adapter to the network. The definitions of the bits in
this word depend on the drive, and are shown in
.
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.
PowerFlex 4-Class (Component Class) Drives
The Allen-Bradley PowerFlex 4-Class family of drives supports DSI
and, at the time of publication, includes the PowerFlex 4, PowerFlex 40,
PowerFlex 40P, and PowerFlex 400. These drives can be used for
applications ranging from 0.2…110 kW (0.25…150 HP).
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 setpoint (for example, speed, frequency,
torque) to the drive. It consists of one 16-bit word of output to the
adapter from the network.