Rockwell Automation 8520-ARM2 9/Series CNC AMP Reference Manual Documentation Set - Manual (Page 373)

Spindle 3 Parameters
Chapter 14
14-9
Function
This parameter specifies the number of available spindle gear ranges for a
specific machine application. The control allows for 8 spindle gear ranges.
Important: If the machine does not have multiple spindle gear ranges,
enter 1 for this parameter.
Parameter
Number
[872]
Range
0 to 8
Notes
Actual spindle gear changing is implemented through PAL. When PAL
sets the gear mode request flag to “automatic,” the control uses this
parameter and the other AMP gear parameters to determine the correct
gear for the commanded spindle speed. It then requests gear changes from
PAL as needed. Refer to your PAL reference manual for more
information.
This parameter must be set for each spindle axis.
This feature is not available on the 9/230, 9/260 or 9/440 controls.
14.5
Number of Gears Used