Rockwell Automation 8520-ARM2 9/Series CNC AMP Reference Manual Documentation Set - Manual (Page 631)

Deskew Parameters
Chapter 36
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36-5
Dual Processing Controls
On dual processing controls you are restricted to having two split axis
group per system (not per process). This means you can assign one split
axes to each process. Additionally, if you choose to configure a split axis
as shared (controlled by both processes), the system is restricted to having
only one split axis.
Important: On dual processing controls the slave servos must be the last
servos AMPed in it’s selected process. If the split axis is shared, the slave
servos must be the last servos AMPed on the system in both processes (last
axes on the system before spindles).