Rockwell Automation GMLC Reference Manual - Manual (Page 301)

Publication GMLC-5.2 - November 1999
264 Motion Blocks
See Phase Shift Moves in the Move Axis section of this chapter for more
information on phase shift moves. See Absolute Auto-Correction in this
section for more information on the operation of absolute ratioed auto-
correction.
The corresponding parameters for absolute ratioed auto-correction are the
same as those for absolute auto-correction with the exception that the
absolute position, tolerance, no correction start point, and no correction
end point values are entered in the position units of the registering axis,
not the master axis. In addition, enter the number of feedback counts for
one product cycle on the master axis and for one product cycle on the
registering axis in the Master Axis Cycle and Registering Axis Cycle fields
respectively. These values must be in feedback counts, not position units.
Relative Ratioed Auto-Correction
Relative ratioed auto-correction (like relative auto-correction)
automatically corrects for error trends in the distance between registration
events, using a phase shift move of the slave axis. However, with relative
ratioed auto-correction, the registration distance and registration error are
calculated in the position units of the registering axis (not the master axis)
and converted to master axis units using the ratio of the master axis cycle
and the registering axis cycle. This allows using the hardware registration
input of the registering axis rather than the soft registration position of the
master axis when the hardware registration input of the master axis is
already used.
!
ATTENTION: Be sure to enter the master axis cycle
and registering axis cycle values in feedback counts, not
position units.