G-4
Glossary
PowerFlex 750-Series Drive DeviceNet Option Module User Manual
Publication 750COM-UM002A-EN-P
Faulted Node Recovery
This DeviceNet feature lets you change a configuration of a device that
is faulted on the network. For example, if you add a device to a network
and it does not have a unique address, it will fault. If you have a
configuration tool that supports faulted node recovery and your Option
Module is using parameters to set its node address and data rate, you
can change the node address.
Flash Update
The process of updating firmware in a device. The Option Module can
be flash updated using various Allen-Bradley software tools. Refer to
Flash Updating the Option Module on page 3-11
for more information.
H
Heartbeat Rate
The heartbeat rate is used in Change of State (COS) data exchange. It is
associated with producing data once every EPR (Expected Packet Rate)
duration. There may be four heartbeats before a time-out happens.
HIM (Human Interface Module)
A device that can be used to configure and control a drive. Enhanced
PowerFlex 7-Class HIMs (for example, 20-HIM-A6) can be used to
configure PowerFlex 750-Series drives and their connected peripherals.
Hold Last
When communication is disrupted (for example, a cable is
disconnected), the Option 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 Option Module, it will
continue to run at the same Reference.
I
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.
L
Logic Command/Logic Status
The Logic Command is used to control the PowerFlex 750-Series drive
(for example, start, stop, direction). It consists of one DINT or DWORD
of output from the network to the Option Module. The definitions of the
bits in this word are shown in
.
Summary of Contents for PowerFlex 750-Series
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