Rockwell Automation 20-COMM-E PowerFlex EtherNet/IP Adapter User Manual
Page 286
G-6
Glossary
20-COMM-E EtherNet/IP Adapter User Manual
Publication 20COMM-UM010G-EN-P
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 powerup.
L
Logic Command/Logic Status
The Logic Command is used to control the PowerFlex 7-Class drive (for
example, start, stop, and direction). It consists of one 16-bit word of output
to the adapter from the network. The definitions of the bits in this word
depend on the drive, and are shown in
The Logic Status is used to monitor the PowerFlex 7-Class drive (for
example, operating state and motor direction). It consists of one 16-bit word
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-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 (Nonvolatile 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 software) 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 hierarchy can
be set up so that a scanner configures or transmits data to one PowerFlex
7-Class drive which then sends the same configuration or data to other
PowerFlex 7-Class drives on the network. To use a peer-to-peer hierarchy,
you configure one adapter to transmit data (2 or 4 words) and one or more
adapters to receive the data.