Rockwell Automation Publication MOTION-UM003K-EN-P - January 2019 337
Glossary
The following terms and abbreviations are used throughout this manual. For
definitions of terms that are not listed here, refer to the Allen-Bradley
Industrial Automation Glossary, publication AG-7.1
.
Absolute Position Retention (APR) While Homing creates an absolute machine reference position, the APR bit is
designed to retain the absolute position.
Axis A logical element of a motion control system that exhibits some form of
movement. Axes can be rotary or linear, physical, or virtual, controlled, or
observed.
Bus Regulator Used to limit the rise in DC Bus voltage level that occurs when decelerating a
motor.
CIP™ Common Industrial Protocol.
CIP Sync Defines extensions to CIP Common objects and device profiles to support
time synchronization over CIP Networks.
Closed-loop A method of control where there is a feedback signal that is used to drive the
actual dynamics of the motor to match the commanded dynamics by servo
action. In most cases, there is a literal feedback device to provide this signal, but
in some cases the signal is derived from the motor excitation, for example,
sensorless operation.
Converter A device that generally converts AC input to DC output. A Converter is also
commonly called the Drive Power Supply. In the context of a drive system, the
Converter is responsible for converting AC Main input into DC Bus power.
Course (Base) Update Period The base update period of the update task of the motion group, which is
specified in milliseconds.
Cyclic Data Block A high priority real-time data block that is an integrated motion on the
EtherNet/IP™ network connection transfers on a periodic basis.
Drive A device that is designed to control the dynamics of a motor.
Event Data Block A medium priority real-time data block that an integrated motion on the
EtherNet/IP network connection transfers only after a specified event occurs.
Registration and marker input transitions are typical drive events.
Get/Read A Get/Read involves the retrieval of an attribute value from the perspective of
Controller side of the interface.
Integrated Motion on the EtherNet/
IP network I/O Connection
The I/O connection is the periodic bidirectional, Class 1, CIP connection
between a controller and a drive that is defined as part of the integrated motion
on the EtherNet/IP network standard.
Integrated Motion on the EtherNet/
IP Network Drive
Any drive device that complies with the integrated motion on the EtherNet/IP
network standard.
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