Rockwell Automation 25B PowerFlex 525 Embedded EtherNet/IP Adapter User Manual
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Rockwell Automation Publication 520COM-UM001B-EN-E - March 2013
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Glossary
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.”
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.
Ping
A message that is sent on the network to determine if a node exists.
PowerFlex 525 Drives
The Allen-Bradley PowerFlex 525 drives are part of the PowerFlex 520-series of
drives.
Reference/Feedback
The Reference is used to send a setpoint (for example, speed, frequency, torque)
to the drive. It consists of one 32-bit word of output to the adapter from the
network.
RSLogix
RSLogix software is a tool for configuring and monitoring controllers to
communicate with connected devices. It is a 32-bit application that runs on
various Windows operating systems. Information about RSLogix software can be
found at
.
Scanner
A scanner is a separate module (of a multi-module controller) or a built-in
component (of a single-module controller) that provides communication with
adapters connected to a network. See also Controller.
Status Indicators
Status indicators are LEDs that are used to report the status of the adapter,
network, and drive. They are on the adapter and can be viewed on the front cover
of the drive when the drive is powered.
Subnet Mask
An extension to the IP addressing scheme that lets you use a single network ID
for multiple physical networks. A bit mask identifies the part of the address that
specifies the network and the part of the address that specifies the unique node
on the network. A “1” in the subnet mask indicates the bit is used to specify the
network. A “0” in the subnet mask indicates that the bit is used to specify the
node.
For example, a subnet mask on a network may appear as follows: 11111111
11111111 11111111 11000000 (255.255.255.192). This mask indicates that 26
bits are used to identify the network and 6 bits are used to identify devices on
each network. Instead of a single physical Class C network with 254 devices, this
subnet mask divides it into four networks with up to 62 devices each.