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XPS-Q8 Controller
XPSDocumentation V1.4.x (EDH0301En1060 — 10/17)
one trigger pulse is generated (since the stage, seen by the controller, is moving back
and forth). A higher value setting for the EncoderSettlingTime could avoid these
unwanted and unpredictable extra trigger pulses in this case.
Figure 47: Position Compare Output.
The following functions are used to configure the distance spaced pulses:
PositionerPositionCompareSet
PositionerPositionCompareGet
PositionerPositionCompareEnable
PositionerPositionCompareDisable
The function PositonerPositonCompareSet() defines the position window and the
distance for the trigger pulses. It has four input parameters:
Positioner Name
Minimum Position
Maximum Position
Position Step
To enable the distance spaced pulses, the function PositionerPositionCompareEnable()
must be sent.
Example
GroupInitialize(MyStage)
GroupHomeSearch(MyStage)
PositionerPositionCompareSet(MyStage.X,5, 25, 0.002)
PositonerPositionCompareEnable(MyStage.X)
PositionerPositionCompareGet(MyStage, &MinimumPosition,
&MaximumPosition, &PositionStep, &EnableState)
This function returns the parameters previously defined, the minimum
position 5, the maximum position 25, the position step 0.002 and the enabled
state (1=enabled, 0 =disabled).
GroupMoveAbsolute(MyStage,30)
PositionerPositionCompareDisable(MyStage.X)
The group has to be in a READY state for the position compare to be enabled. Also, the
PositionerPositionCompareSet() function must be completed before the
PositionerPositionCompareEnable() function. In this example, one trigger pulse is
generated every 0.002 mm between the minimum position of 5 mm and the maximum
position of 25 mm. The first trigger pulse will be at 5 mm and the last trigger pulse will
be at 25 mm.
The output pulses are accessible from the PCO connector at the back of the XPS
controller, See appendix E, PCO connector, for details.
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Motion Tutorial
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