Rockwell Automation PowerFlex 755 Drive, Руководство пользователя

Страница: 221 / 232

Glossary G-5
PowerFlex® 755 Drive Embedded EtherNet/IP Adapter User Manual
Publication 750COM-UM001A-EN-P
the first three bytes contain the network address (subnet mask =
255.255.255.0). This leaves 8 bits or 256 addresses on your network.
Because two addresses are reserved for special uses (0 is an address for
the network usually used by the router, and 255 is an address for
broadcast messages to all network devices), you have 254 addresses to
use on a Class C address block.
To ensure that each device on the Internet has a unique address, contact
your network administrator or Internet Service Provider for unique
fixed IP addresses. You can then set the unique IP address for the
adapter by using a BOOTP server or by manually configuring
parameters in the adapter. The adapter reads the values of these
parameters only at power-up.
L
Logic Command/Logic Status
The Logic Command is used to control the PowerFlex 750-Series drive
(for example, start, stop, direction). It consists of one 32-bit word of
output to the adapter from the network. The definitions of the bits in this
word are shown in
Appendix D .
The Logic Status is used to monitor the PowerFlex 750-Series drive (for
example, operating state, motor direction). It consists of one 32-bit
word of input from the adapter to the network. The definitions of the
bits in this word are shown in
Appendix D .
M
Master-Slave Hierarchy
An adapter configured for a master-slave hierarchy exchanges data with
the master device. Usually, a network has one scanner which is the
master device, and all other devices (for example, drives connected to
EtherNet/IP adapters) are slave devices.
On a network with multiple scanners (called a multimaster hierarchy),
each slave device must have a scanner specified as a master.
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
PCCC (Programmable Controller Communications Command)
PCCC is the protocol used by some controllers to communicate with
devices on a network. Some software products (for example,
DriveExplorer and DriveExecutive) also use PCCC to communicate.
Peer-to-Peer Hierarchy
An adapter that is configured for a peer-to-peer hierarchy can exchange
data with a device on the network that is not a scanner. This type of