ADLINK PCI-8258 - Manual (Page 174)

160 Motion Control Theory
Bit 17: Blending movement - BLD
Continuous interpolation has several speed succession method.
The blending method has a transition region at the interconnection
points of two paths (as shown in figure below). The BLD signal
indicate that the axis is entering this area.
Figure 4-63: Relation of blending (BLD) signal VS motion
Bit 18 and 19: Pre- and post distance event
Every position movement command can set up pre-distance and
post-distance to trigger the controller to issue signals when
distance of movement meet given conditions.
The controller starts recording shift distance of movement when point
to point movement is started. When distance of movement is greater
than pre-distance, the pre-distance event occurs. Similarly, when
remaining shift distance of the point to point movement is less than
the post-distance then post-distance event occurs. Relation between
movement and signal shown in figure below:
Start deceleration
V
I II
Blending
T
Time
BLD
Transition
area
E1
S1 E2