National Instruments NI-Motion - Manual (Page 100)

Chapter 7 Contoured Moves
NI-Motion User Manual 7-4 ni.com
All contoured moves are relative, meaning motion starts from the position
of the axis or axes at the time the contouring move starts. This behavior is
similar to the way arc moves work. Depending on the operation mode you
use, you can load absolute positions in the array or relative positions, which
imply incremental position differences between contouring points.
Absolute versus Relative Contouring
If an axis starts at position 0 and uses either of the following sets of
contouring points, the axis ends up at position 28. If the axis starts at
position 10, it ends up at position 38 in both cases.
Figure 7-3. Absolute Contouring Buffer Values
Figure 7-4. Relative Contouring Buffer Values
1 3 6 10 14 18 22 25 27 28
1 2 3 4 4 4 4 3 2 1