National Instruments NI-Motion - Manual (Page 57)

Chapter 5 Straight-Line Moves
NI-Motion User Manual 5-2 ni.com
The start position is always the current position of the axis or axes. You can
load the end position as either an absolute position to move to or as a
position relative to the starting position. Although you can update any
parameter while the move is in progress, the new parameter is used only
after a subsequent Start or Blend Move.
Tip You must load the move constraints only if they are different from what was
previously loaded.
Figure 5-1. Position-Based Straight-Line Move Algorithm