ADLINK Technology cPCI-8168, User Manual

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Operation Theory 63
4.2.14 Speed Override Function
Speed override means that users can change a command’s speed
during the operation of motion. The changed parameter is a per-
centage of the speed originally defined. Users can define a 100%
speed value then change the speed by a percentage of the origi-
nal speed while the machine is still in motion. If users didn’t define
the 100% speed value. The default 100% speed is the latest
motion command’s maximum speed. This function can be applied
to any motion function. If the running motion is an S-curve or bell
curve, the speed override will be a pure s-curve. If the running
motion is a t-curve, the speed override will be a t-curve.
4.2.15 Position Override Function
Position override is when users want to change the target position
of the original positioning command during its operation. If the new
target position is behind the current position when the override
command is issued, the motor will slow down and then reverse to
the new target position. If the new target position is far away from
current position but in the same direction, the motion will maintain
its speed and move to the new target position. If the override tim-
ing requires deceleration from the current motion, and the target
position is far away from the current position but the same direc-
tion, motion will accelerate to the original speed and run to the
new target position. The operation examples are shown below.