Rockwell Automation 8520-MUM 9/Series CNC Mill Operation and Programming Manual Documentation Set - Manual (Page 478)

Dual Axis Operation
Chapter 19
19-4
CAUTION: Care must be taken when an axis is unparked.
When an axis is unparked, any incremental positioning requests
made to the dual axis group are referenced from the current
location of all axes in the dual group. This includes any manual
jogging or any incremental part program moves. When an axis
is unparked, we recommend the next command made to the dual
axis group is an absolute command to re-align the axes in the
dual group to the same position.
Parking an axis in a dual group is performed through PAL. Refer to the
system installer’s documentation for details on how axes are parked.
Important: Some systems may have special parking requirements when
homing axes in a dual group.
There are two different methods to home axes in a dual axis group. The
system installer determines through PAL which method is available. The
two methods are:
home each axis in the dual group individually
home all axes in the dual group simultaneously
Both of these homing methods can be available for automatic (G28) as
well as manual homing operations.
The system installer can also define independent speeds and home
positions for each axis in a dual group through AMP. This applies to both
homing methods. Refer to the system installer’s documentation for details
on these speeds and locations.
Homing Axes Individually
This method requires that each axis be homed individually. When a
manual home operation is performed, a home request must be made to
each axis in the dual group individually. Refer to chapter 4 for details on
how to request a manual home operation.
19.1.2
Homing a Dual Axis