ADLINK PCI-8158 - Manual (Page 75)

Operation Theory 65
4.2.14 Speed Override Function
Speed override means that you can change speed of the com-
mand during the operation of motion. The change parameter is a
percentage of original defined speed. You can define a 100%
speed value then change the speed by percentage of original
speed when motion is running. If users didn’t define the 100%
speed value. The default 100% speed is the latest motion com-
mand’s maximum speed. This function can be applied on any
motion function. If the running motion is S-curve or bell curve, the
speed override will be a pure s-curve. If the running motion is t-
curve, the speed override will be a t-curve.
4.2.15 Position Override Function
Position override means that when you issue a positioning com-
mand and want to change its target position during this operation.
If the new target position is behind current position when override
command is issued, the motor will slow down then reverse to new
target position. If the new target position is far away from current
position on the same direction, the motion will remain its speed
and run to new target position. If the override timing is on the
deceleration of current motion and the target position is far away
from current position on the same direction, it will accelerate to
original speed and run to new target position. The operation exam-
ples are shown as below. Notice that if the new target position’s