Rockwell Automation 22-COMM-B PowerFlex BACnet MS/TP Adapter User Manual
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Glossary
G-3
Flash Update
The process of updating firmware in a device. The adapter can be flash
updated using various Allen-Bradley software tools. Refer to
Updating the Adapter on page 3-10
for more information.
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 communications are 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
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.
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 adapter from the network. The definitions of the bits in this word
depend on the drive, and are shown in the drive’s documentation.
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 adapter to the network. The definitions of the bits in
this word depend on the drive, and are shown in the drive’s
documentation.
M
MAC Address
Each device on a network must have a unique MAC address to identify
it. On BACnet MS/TP networks, devices can have MAC addresses
between 0 and 127 if the network is set up to accommodate that number
of devices.