Rockwell Automation GMLC Reference Manual - Manual (Page 292)

Publication GMLC-5.2 - November 1999
Auto Correction (Configure Cam) 255
Phase Shift and Incremental Auto-Correction
Select Phase to perform auto correction only by phase shifting the slave
axis relative to the master axis. This is the default selection. All four auto
correction types (relative, absolute, relative ratioed, and absolute ratioed)
use phase shift auto correction, whether or not you select Phase (even if
you select Incremental).
Select Incremental to perform a second level of auto correction by
incrementing (adding or subtracting) a constant value to the slave axis
values set in the cam table. Selecting Incremental is much the same as
executing an incremental Move Axis block for the slave axis while the
position lock cam is operating.
See Moving While Camming in the Position Lock Cam section of this
chapter for more information on the effects of incremental moves and
phase shift moves of the slave axis cam values.
Absolute Auto-Correction
Use absolute auto-correction to automatically correct for registration error
via a phase shift move of the slave axis upon the occurrence of every
registration event, as shown in the following figure.