Rockwell Automation GMLC Reference Manual - Manual (Page 311)

Publication GMLC-5.2 - November 1999
274 Motion Blocks
Increasing the total time of a cam profile decreases the velocities and
accelerations of the profile, while increasing the total distance increases
the velocities and accelerations of the profile. To maintain the velocities
and accelerations of the scaled profile approximately equal to those of the
unscaled profile, total time and total distance should be scaled in
proportion to one another. For example, if you double the total distance of
a profile by scaling, the total time should also be doubled to maintain
approximately equal velocities and accelerations during execution of the
scaled time-lock cam.
Position Lock CAM
Use the Position Lock Cam block to execute a position-lock cam profile
set up by a previous Configure Cam block on the selected servo or
imaginary slave axis, in the selected direction, using the selected master
axis.
Position-lock cams provide the capability of implementing non-linear
electronic gearing relationships between two axes. No maximum velocity,
acceleration, or deceleration limits are used. The speed, acceleration, and
deceleration of the slave axis is completely determined by the motion of
the master axis and the profile stored in the cam tables.
The Position Lock Cam block resides on the CAM Palette.
!
ATTENTION: When you use scaling to decrease the
total time, or increase the total distance of a time-lock
cam, the required velocities and accelerations of the
profile increase. This causes a motion fault if the
increased velocities and accelerations exceed the drive
system’s capabilities.