User manual

Rockwell Automation Publication MOTION-UM003F-EN-P - March 2015 285
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 An axis is 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 simply
observed.
Bus Regulator A bus regulator is used to limit the rise in DC Bus voltage level that occurs when
decelerating a motor.
CIP Common Industrial Protocol.
CIP Sync CIP Sync defines extensions to CIP Common objects and device profiles to
support time synchronization over CIP Networks.
Closed Loop Closed loop is a method of control where there is a feedback signal of some kind
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 converter is 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 motion group's update task, which is specified in
milliseconds.
Cyclic Data Block The cyclic data block is a high priority real-time data block that is transferred by
an Integrated Motion on the EtherNet/IP network connection on a periodic
basis.
Drive A drive is a device that is designed to control the dynamics of a motor.
Event Data Block The event data block is a medium priority real-time data block that is transferred
by an Integrated Motion on the EtherNet/IP network connection only after a
specified event occurs. Registration and marker input transitions are typical drive
events.
Get/Read A Get/Read involves retrieving an attribute value from the perspective of
Controller side of the interface.
Integrated Motion on the EtherNet/
IP Network
Defines extensions to CIP Common objects and device profiles to support
motion control over CIP networks.