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XPS-Q8 Controller
This home search process guarantees that the last segment, E, is always performed in
the positive direction of travel and at the same reduced speed. This method ensures an
precise and repeatable reference position.
There are 7 different home search processes available in the XPS controller:
1. MechnicalZeroAndIndexHomeSearch is used when the positioner has a hardware
home switch plus a zero index from the encoder. This process is the default for most
Newport standard stages.
2. MechanicalZeroHomeSearch is used with positioners that have a hardware home
switch but with no zero index from the encoder.
3. IndexHomeSearch is used with positioners that have a home index, but with no
hardware home switch signal. In this process, the positioner initially moves in the
positive direction to find the index. When a + limit switch is detected, the direction
of motion reverses until the index is found.
For users with CIE03 (E3425x) boards, if a limit is detected before the index,
there will be an emergency brake and the group will go in NOT_INITIALIZED
status.
4. CurrentPositionAsHome is used when the positioner has no home switch or index.
This process will keep the positioner's home at its current location. Setting the home
too close to the EOR could generate unwanted emergency stops. Start with around
50 MIM (Minimum Incremental Movement) units, but an optimum distance may be
determined by trial and error, depending on the stage.
This feature can also be used to set home arbitrarily and bypass a home switch.
5. MinusEndOfRunAndIndexHomeSearch uses the positioner's minus end-of-run
limit as a hardware home switch and a zero index from the encoder. This process is
comparable to MechanicalZeroAndIndexHomeSearch, but uses the minus end-of-
run limit signal as hardware home switch and moves in the positive direction until
the Index is reached. Otherwise, it will reach the positive limit or a timeout will
occur. The positioner homes to a position that is different from the
MechanicalZeroAndIndexHomeSearch location.
6.
MinusEndOfRunHomeSearch uses the positioner's minus end-of-run limit for
homing. Note that the emergency stop at the negative limit is disabled during
homing.
7. PlusEndOfRunHomeSearch uses the positioner's plus end-of-run limit for homing
and the emergency stop at the positive limit is disabled during homing.
This home search works only with the CIE05 (E3920x) board or later versions.
The home search process is set up in the stages.ini file. When using the XPS controller
with Newport ESP-compatible stages, this setting is done automatically with the
configuration of the system. The home search velocity, acceleration and time-out are
also set up in the stages.ini file.
Each motion group can either be homed "together" or "sequentially", meaning all
positioners belonging to that group home at the same time in parallel or all the
positioners home one after the other, respectively. This option is also set up in the
system.ini file or during configuration.
A Home search can be executed with all motion groups and any motion group MUST
be homed before any further motion can be executed. To home a motion group that is in
a "ready" state, that motion group must first be "killed" and then "re-initialized".
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Note
Note
XPSDocumentation V1.4.x (EDH0301En1060 — 10/17)
Motion Tutorial
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