Rockwell Automation 25-COMM-D PowerFlex 525 DeviceNet Adapter - Manual (Page 134)

134 Rockwell Automation Publication 520COM-UM002A-EN-E - April 2013
Glossary
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 adapter is using parameters to set its node address
and data rate, you can change the node address.
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. The PowerFlex 22-
HIM-A3 or 22-HIM-C2S HIM can be used to configure PowerFlex 525 drives
and their connected peripherals.
Hold Last When communication is disrupted (for example, a cable is disconnected), the
adapter and its PowerFlex 525 drive can respond by holding last. Hold last results
in the drive receiving the last data received through 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.
Idle Action An idle action determines how the adapter and its PowerFlex 525 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 adapter. Input is produced by
the adapter and consumed by the controller.
Logic Command/Logic Status The Logic Command is used to control the PowerFlex 525 drive (for example,
start, stop, direction). It consists of one 32-bit word of output to the adapter 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 525 drive (for example,
operating state, motor direction). It consists of one 32-bit word of input from the
adapter to the network. The definitions of the bits in this word are shown in
Appendix D .
Master-Slave Hierarchy An adapter 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 connected to DeviceNet adapters) are slave
devices.
On a network with multiple scanners (called a multi-master hierarchy), each slave
device must have a scanner specified as a master.