Rockwell Automation 8520-ARM2 9/Series CNC AMP Reference Manual Documentation Set - Manual (Page 628)

Deskew Parameters
Chapter 36
36-2
Figure 36.1
Split Axis Configuration
Lead screw
Servo
motor 1
Encoder
Lead screw
Servo
motor 2
Encoder
Split Axis - One moving axis
controlled by two completely
separate servos.
AXIS
Both servos that comprise a split axis must respond to the same part
program and jog commands. When a split axis is configured using deskew,
the two servos that make up the split axis are accelerated, positioned,
decelerated, and stopped at the same time (except at E-Stop reset and
when homing).
There are two cases in which the servos of a split axis do not receive the
same motion commands:
Homing
When homing the split axis, a single home limit switch is used. The
distance from that limit switch to the home position is dependent on the
closest marker position and the value entered for Home Calibration.
The difference between the two home calibration values and the
direction and distance to the closest marker are independent for both
axes. This means they can receive different positioning commands to
reach the home position.