Yaskawa MotionWorks+ Windows Software - Manual (Page 216)

Appendix C MW+ Camming 101 MotionWorks+™
210
Why is a window required?
The window is a built in function of MW+. It is required because in the dynamic world of
motion, it is quite difficult if not impossible to compare to an exact position. Each time
the controller scans the position of the external encoder; it’s only a snapshot. If the
encoder is moving, the “snapshots” may never match the exact value entered as the
“External Position.”
Note: Note: The window spans from the position defined in the CAM block forward. It
is not equally centered on the position specified.
CAM BLOCK
External Position
Property
Machine Cycle / 120
or 0.83% Window