Rockwell Automation 1784-PM16SE SoftLogix Motion Card Setup and Configuration Manual - Manual (Page 307)

Publication 1784-UM003A-EN-P – June 2003
Motion Object Attributes 299
Motion Dynamics
Configuration
Maximum Speed The value of the Maximum Speed attribute is used by various motion
instructions (e.g. MAJ, MAM, MCD, etc.) to determine the steady-state speed
of the axis. These instructions all have the option of specifying speed as a
percent of the Maximum Speed attribute value for the axis. The Maximum
Speed value for the axis is automatically set to the Tuning Speed by the MAAT
(Motion Apply Axis Tune) instruction. This value is typically set to ~90% of
the maximum speed rating of the motor. This provides sufficient “head-room”
for the axis to operate at all times within the speed limitations of the motor. .
Maximum
Acceleration/Deceleration
The Maximum Acceleration and Deceleration attribute values are frequently
used by motion instructions such as MAJ, MAM, MCD, etc., to determine the
acceleration and deceleration rates to apply to the axis. These instructions all
have the option of specifying acceleration and deceleration as a percent of the
Maximum Acceleration and Maximum Deceleration attributes for the axis.
The Maximum Acceleration and Maximum Deceleration values for the axis are
automatically set to ~ 85% of the measured Tune Acceleration and Tune
Deceleration by the MAAT (Motion Apply Axis Tune) instruction. If set
manually, these values should typically be set to ~85% of the maximum
acceleration and maximum deceleration rate of the axis. This provides
sufficient “head-room” for the axis to operate at all times within the
acceleration and deceleration limits of the drive and motor.
GSV/SSV Access Attribute Name Data Type Values
SSV/GSV Maximum Speed REAL Position Units / Sec
GSV/SSV Access Attribute Name Data Type Values
SSV/GSV Maximum Acceleration REAL
Position Units / Sec
2
SSV/GSV Maximum Deceleration REAL
Position Units / Sec
2