Rockwell Automation PowerFlex 750-Series, Руководство пользователя

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Glossary G-5
PowerFlex 750-Series Drive DeviceNet Option Module User Manual
Publication 750COM-UM002A-EN-P
The Logic Status is used to monitor the PowerFlex 750-Series drive (for
example, operating state, motor direction). It consists of one DINT or
DWORD of input from the Option Module to the network. The
definitions of the bits in this word are shown in
Appendix D .
M
Master-Slave Hierarchy
An Option 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 with
installed DeviceNet Option Modules) are slave devices.
On a network with multiple scanners (called a multimaster hierarchy),
each slave device must have one scanner specified as a master.
N
Node Address
A DeviceNet network can have as many as 64 devices connected to it.
Each device on the network must have a unique node address between 0
and 63. Node address 63 is the default used by uncommissioned
devices. Node addresses are sometimes called “MAC IDs.”
NVS (Non-Volatile Storage)
NVS is the permanent memory of a device. Devices such as the Option
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.”
O
Option Module
Devices such as drives, controllers, and computers usually require a
network communication Option Module to provide a communication
interface between them and a network such as DeviceNet. An Option
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 20-750-DNET DeviceNet Option Module connects PowerFlex
750-Series drives to a DeviceNet network. Option Modules are
sometimes also called “adapters,” “cards,” “embedded communication
options,” and “peripherals.” On PowerFlex 750-Series drives, Option
Modules can also be I/O, encoders, safety, etc.
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.
Ping
A message that is sent by a DPI product to its peripheral devices. They
use the ping to gather data about the product, including whether it can
receive messages and whether they can log in for control.