338 Rockwell Automation Publication MOTION-UM003K-EN-P - January 2019
Glossary
Inverter A device that generally converts DC input to AC output. An Inverter is also
commonly called the Drive Amplifier. In the context of a drive system, the
Inverter is responsible for controlling the application of DC Bus power to an
AC motor.
Motion Any aspect of the dynamics of an axis. In the context of this document, it is not
limited to servo drives but encompasses all forms of drive-based motor control.
Motion Group A user-defined grouping of motion axes. A motion group has configuration
parameters and status attributes that apply to all axes in the group.
Multiplexing The method by which multiple signals are combined into one signal for
transmission.
Multiplex Update Multiplier Number of multiplexed drives that determines the multiplex update period.
Multiplex Update Period Task update period for a Multiplexed Axis.
Open-loop A method of control where there is no application of feedback to force the
actual motor dynamics to match the commanded dynamics. Examples of open-
loop control are stepper drives and variable-frequency drives.
Safe Torque Off (STO) Provides a method, with sufficiently low probability of failure, to force the
power-transistor control signals to a disabled state. When the command to
allow torque ceases from the GuardLogix® controller, all drive output-power
transistors are released from the On-state.
For complete information about the Safe Torque Off feature, see the Kinetix®
Multi-axis servo EtherNet/IP drive User Manual, publication 2198-UM002
.
Service Data Block A lower priority real-time data block associated with a service message from the
controller that an integrated motion on the EtherNet/IP network connection
transfers on a periodic basis. Service data includes service request messages to
access attributes, run a drive-based motion planner, or perform various drive
diagnostics.
Set/Write A Set/Write involves setting an attribute to a specified value from the
perspective of the Controller side of the interface.
Shunt Regulator A specific Bus Regulator method that switches the DC Bus across a power
dissipating resistor to dissipate the regenerative power of a decelerating motor.
Synchronized A condition where the local clock value on the drive is locked onto the master
clock of the distributed System Time. When synchronized, the drive and
controller devices can use time stamps that are associated with an integrated
motion on the EtherNet/IP network connection data.
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