Rockwell Automation 8520-ARM2 9/Series CNC AMP Reference Manual Documentation Set - Manual (Page 342)

Spindle 1 Parameters
Chapter 12
12-14
Function
This parameter determines the spindle speed in RPM that the control uses
when positioning the spindle during a spindle orient (M19).
Refer to your programming and operation manuals for more information
on spindle orient.
Spindle Parameter
Number
1 [858]
Range
0.0 to 99999.9 rpm
Notes
The orient speed is usually a very low value to assure that the spindle
moves accurately to the orient position.
Executing an M19 may require you to force a gear change through PAL to
accommodate the spindle speed entered here. Automatic gear selection
through PAL will only select gears based on the last entered programmed
spindle speed.
This parameter must be set for each spindle.
12.10
Orient Speed