Rockwell Automation 20-COMM-R Remote I/O Adapter User Manual
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G-4
Glossary
20-COMM-R Remote I/O Adapter User Manual
Publication 20COMM-UM004D-EN-P
H
HIM (Human Interface Module)
A device that can be used to configure and control a drive. PowerFlex
7-Class HIMs (catalog number 20-HIM-xx) can be used to configure
PowerFlex 7-Class drives and their connected peripherals.
Hold Last
When communication is disrupted (for example, a cable is disconnected),
the adapter 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 adapter, it will continue to run at the same Reference.
I
Idle Action
An idle action determines how the adapter 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 adapter. Input is
produced by the adapter and consumed by the controller.
The 20-COMM-R adapter supports two types of I/O: Discrete and Block
Transfer.
L
Last RIO Rack
The last rack switch or parameter setting notifies a controller that the
adapter is the last physical device with its rack address. You must set this
switch or parameter to ‘On’ or ‘enabled’ if the drive is the last device with a
specific rack address and you are using a PLC-2 controller. We also
recommend that you set this switch or parameter to ‘On’ or ‘enabled’ when
using other controllers.
Logic Command/Logic Status
The Logic Command is used to control the PowerFlex 7-Class drive (for
example, start, stop, and direction). It consists of one 16-bit word of output
to the adapter from the network. The definitions of the bits in this word
depend on the drive, and are shown in
The Logic Status is used to monitor the PowerFlex 7-Class drive (for
example, operating state and motor direction). It consists of one 16-bit word
of input from the adapter to the network. The definitions of the bits in this
word depend on the drive, and are shown in
N
NVS (Nonvolatile 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’.