Rockwell Automation 8520-ARM2 9/Series CNC AMP Reference Manual Documentation Set - Manual (Page 375)

Spindle 3 Parameters
Chapter 14
14-11
Range
Min. Spindle Speed: 0 to Max. Spindle Speed (rpm)
Max. Spindle Speed: Min. Spindle Speed to 99999.9(rpm)
Notes
This parameter must be set for each spindle axis.
Digital Spindle users must set this parameter (for gear 1 only) in addition
to setting the servo parameter “Maximum Motor Speed” to define valid
motor speeds.
This feature is not available on the 9/230, 9/260 or 9/440 controls.