ADLINK PCI-8164 - Manual (Page 142)

130 Operation Theory
Constraints of _8164_p_change():
1. _8164_p_change() is only applicable on single-axis
absolute pre-set motion, i.e.
_8164_start_ta_move(), and
_8164_start_sa_move() only.
2. Position change during the deceleration period is not
allowed.
3. There must be enough distance between the new target
position and current position where
_8164_p_change() is executed because the 8164
needs enough space to finish deceleration.
For example:
A trapezoidal absolute motion is applied:
_8164_start_ta_move(0,10000,0,1000,0.5,1).
It cause axis 0 to move to pulse 10000 position with a maximum
velocity of 1000 PPS. The necessary number of pulses to deceler-
ate is 0.5*1000*1 = 500.
At position “CurrentPos,” _8164_p_change(0, NewPos) is
applied.