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Chapter 3
Interpret the Attribute Tables
90
Rockwell Automation Publication MOTION-RM003I-EN-P - February 2018
Column Heading
Description
Semantics of Values
The meaning of the attribute values.
For example: Position Units / Sec.
Tag access is supported by value is valid only when Auto Tag Update of the Motion
Group Object is enabled.
There may be additional information in the description that directly follows the
attribute listing.
CST
Coordinated System Time
See also
Identify Motion Axis Attributes Based on Device Function Codes
Attribute Units define the unit nomenclature found in the Semantics of Values
column for many of the Motion Control Axis Attributes. In general, attribute
values are specified in units that are relevant to motion control engineers.
Attribute Unit Cross-referencing
Attribute Unit
Applicable Units
Semantics of Values
Position Unit
User String
User-defined unit of measure of motion displacement, for
example, meters, feet, inches, millimeters, revolutions, or
degrees.
Velocity Units
Position Units/Sec
For example, Revs/Sec, Inches/Sec
Accel Units
Position Units/Sec
2
For example, Revs/Sec
2
, Inches/Sec
2
Jerk Units
Position Units/Sec
3
For example, Revs/Sec
3
, Inches/Sec
3
% Device Rated
%
Defined as the percentage of the continuous rating of the
device with 100% implying operation at the continuous rated
specification for the device.
This unit can be applied to attributes related to speed,
torque, force, current, voltage, and power.
Applicable devices can be a motor, inverter, converter, or a
bus regulator.
This unit can be used independent of whether the attribute
value represents an instantaneous level or a time-averaged
level; the appropriate unit for the device rating is implied. As
with all attributes that are in units of %, an attribute value of
100 means 100%.
Power Units
Kw
Kilowatts
Inertia Units
Kg-m
2
Kilogram-Meter
2
Mass Units
Kg
Kilogram
Loop Bandwidth Units
Hz
Hertz
Attribute Units