Attribute Units

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
Filter Frequency Units
Hz
Hertz
Counts
Fundamental control unit for distance.
For example, feedback counts or planner counts.
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