Rockwell Automation GMLC Reference Manual - Manual (Page 289)

Publication GMLC-5.2 - November 1999
252 Motion Blocks
See System Variable in the Expression Builder chapter of this manual for
more information on variables.
Selecting Once in the Perform Profile field causes the new (pending) cam
profile to initiate and execute only once, when the master axis passes
through either the start or end point of the current profile. When the
master axis moves outside the range of the new profile, cam motion on
the slave axis stops; it resumes when and if the master moves back into
the profile range specified by the start and end points.
Selecting Continuously in the Perform Profile field causes the new
(pending) cam profile to initiate and execute indefinitely, when the master
axis passes through either the start or end points of the current profile.
With continuous operation, the new profile master and slave positions are
unwound when the master axis moves outside the profile range, causing
the cam profile to repeat indefinitely. To generate smooth continuous
motion using this technique, however, take care in designing the cam
profile to ensure that there are no position, velocity, or acceleration
discontinuities between the start and end points of the profile.
Master Position
Current
Profile
New
Profile
Slave
Position
PCAM_pending_
profile_status
Pending (New)
Position-Lock Cam
Configured