Rockwell Automation 20-750-CNETC PowerFlex Coaxial ControlNet Option Module - Manual (Page 141)

Rockwell Automation Publication 750COM-UM003B-EN-P - November 2012 141
Glossary
Idle Action An idle action determines how the option module and connected drive act when
the controller is switched out of run mode.
I/O Data I/O data, sometimes called ‘implicit messages’ or ‘input/output’, is time-critical
data such as a Logic Command and Reference. The terms ‘input’ (To Net) and
‘output’ (From Net) are defined from the controller’s point of view. Output is
produced by the controller and consumed by the option module. Input is
produced by the option module and consumed by the controller.
Logic Command/Logic Status The Logic Command is used to control the PowerFlex 750-Series drive (for
example, start, stop, and direction). It consists of one 32-bit word of output to the
option module 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 and motor direction). It consists of one 32-bit word of input from
the option module to the network. The definitions of the bits in this word are
shown in
Appendix D .
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 ControlNet option
modules) are slave devices.
On a network with multiple scanners (called a multi-master hierarchy), each slave
device must have one scanner specified as a master.
Node Address The valid range of ControlNet addresses is 1…99. The ControlNet option
module has two rotary switches or
Device Parameter 05 - [Net Addr Cfg] to set
the ControlNet address. The option module reads the values of the switches only
at powerup.
NVS (Nonvolatile 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’.
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 ControlNet. 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-CNETC ControlNet option module connects PowerFlex 750-
Series drives to a ControlNet network. Option modules are sometimes also called
‘adapters’, ‘cards’, ‘embedded communication options’, or ‘peripherals’. On
PowerFlex 750-Series drives, option modules can also be I/O modules, encoder
modules, safety modules, and so forth.
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.