Rockwell Automation 1203-EN1 EtherNet/IP-to-SCANport Module - Manual (Page 174)

G-6 Glossary
M
Master-Slave Hierarchy
A module 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 modules) are slave devices.
On a network with multiple scanners (called a multimaster hierarchy),
each slave device must have a scanner specified as a master.
Module
Devices such as drives, controllers, and computers usually require a
module to provide a communication interface between them and a
network such as EtherNet/IP. A module reads data on the network and
transmits it to the connected device. It also reads data in the device and
transmits it to the network.
The 1203-EN1 EtherNet/IP-to-SCANport module connects
SCANport-supported drives to an EtherNet/IP network. Modules are
sometimes also called “adapters,” “cards,” “embedded communication
options,” “gateways,” and “peripherals.”
N
Non-Volatile Storage (NVS)
NVS is the permanent memory of a device. Devices such as the module
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 DriveTools SP) also use PCCC to communicate.
Peer-to-Peer Hierarchy
A module 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 Allen-Bradley drive which then sends the same configuration or data
to other Allen-Bradley drives on the network. To use a peer-to-peer
hierarchy, you configure one module to transmit data (2 or 4 words) and
one or more modules to receive the data.