Rockwell Automation 1769-SM2 Compact I/O DSI/Modbus Communication Module - Manual (Page 193)

Glossary-3
H
HIM (Human Interface Module)
A device that can be used to configure and control a drive. PowerFlex
4-Class HIMs (22-HIM-A3 or 22-HIM-C2S) can be used to configure
PowerFlex 4-Class drives and their connected peripherals.
Hold Last
When communication is disrupted (for example, the controller is idle),
the module and PowerFlex drive can respond by holding last. Hold last
results in the drive receiving the last data received via the network
connection before the disruption. If the drive was running and using the
Reference from the module, it will continue to run at the same
Reference.
I
Idle Action
An idle action determines how the 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” and “output” are defined from the controller’s point of view.
Output is produced by the controller and consumed by the module. Input
is produced by the module and consumed by the controller.
L
Logic Command/Logic Status
The Logic Command is used to control the PowerFlex 4-Class drive (for
example, start, stop, direction). It consists of one 16-bit word of output to
the module from the network. The definitions of the bits in this word
depend on the drive, and are shown in
Appendix D .
The Logic Status is used to monitor the PowerFlex 4-Class drive (for
example, operating state, motor direction). It consists of one 16-bit word
of input from the module to the network. The definitions of the bits in
this word depend on the drive, and are shown in
Appendix D .
N
NVS (Non-Volatile Storage)
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.”
O
Objects
The CIP common specification defines an object as “an abstract
representation of a particular component within a product.”