Rockwell Automation 8520 9/Series CNC Integration Maintenance Manual Documentation Set - Manual (Page 706)

Integrating a Split Axis with Deskew
Section 14B
14B-12
When motion requests are made to the master servo, both the slave and
master always move to the same location at the same feedrate except in
two cases:
E-Stop when a skew condition exists
The maximum skew amount is set in AMP with the parameter Excess
Skew Limit. When this skew amount is reached the control is forced
into E-Stop and can not be taken out of E-Stop until the axes are
manually moved so that the skew amount is less than the Excess Skew
Limit set in AMP.
Anytime E-Stop is reset and some skew exists within the skew limit, the
control will automatically eliminate the skew. The control automatically
sends separate positioning commands to the slave servo to drive it to a
position where zero skew exists between the master and slave servos.
When 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.
END OF SECTION