Rockwell Automation GMLC Reference Manual - Manual (Page 320)

Publication GMLC-5.2 - November 1999
Position Lock CAM 283
Moving While Camming
You can use an incremental Move Axis block on the slave axis (or master
axis if configured for servo operation) while the position-lock cam is
operating. This is particularly useful to accomplish phase advance/retard
control. The incremental move distance can be used to eliminate any
phase error between the master and the slave, or to create an exact phase
relationship.
You can also use a phase shift move while the position-lock cam is
operating to shift the master reference position of the cam on the fly.
Unlike an incremental move on the slave axis, a phase shift move on the
slave axis shifts the cam profile relative to the master axis, as shown
below.
See Move Axis in this chapter for more information on phase shift moves.
.
Master Axis Position
Slave Axis Position
Profile Stored
in Cam Tables
Profile After Phase Shift
Move of Slave Axis
Profile After Incremental
Move of Slave Axis