APX-3302 User's Manual (OM110000019A)
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6.11.2 Absolute position encoder single point
Absolute position encoder single point is the mode that is suitable for capturing using stage.
For Relative position encoder mode, it resets counter every time pulse coincidence.
For this mode, it always keeps moving distance (counter value) from starting point, so it can be certain start
position on the stage that performs proceeding and returning repeatedly.
It has 32-bit absolute counter and 16-bit interval counter.
For comparison register 1, configure absolute counter value that starts interval counter.
For comparison register 2, configure interval counter that counts number of pulse that generates
coincidence pulse. After finishing configuration of comparison register 1 and 2, configure start condition of
encoder count, then starts count.
Figure6-30: Absolute position encoder single point
- Absolute counter is not reset even if it coincides with comparison register 1. It always keeps the value.
- Interval counter is not reset even if it coincides with comparison register 2.
- Coincidence pulse is outputted when the value of comparison register 1, 2 coincide with each counter
value.
In the above-mentioned figure, configure comparison register 1 as start position A of proceeding direction,
and configure comparison register 2 as generating interval of coincidence pulse.
After start capturing, when absolute counter becomes higher than B, it stops interval count.
Next, configure comparison register 1 as start position C of returning direction, and configure comparison
register 2 as generating interval of coincidence pulse, then enable interval count.
It stops interval count and absolute count when capturing of returning direction is finished and absolute
count becomes lower than D.
Time
Absolute counter value
Value of comparison register 1
Start interval counter
Termination of
interval counter
Termination of
interval counter
Starting
point
Stage stopped
Stage proceed
Value of comparison register 2
Generate coincidence pulse at
interval.
A
B
C
D
Stage return
Value of comparison register 1
Start interval counter
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