
B-63323EN-1/03 4.REFERENCE POSITION ESTABLISHMENT
- 463 -
Scale end
Reference mark
Master
axis
Slave axis
Start point End point
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Fig. 4.7.1 (b) Example of Measuring Three Points
In the above example, the reference mark (1) for the master axis is
detected first, a stop takes place at (1) temporarily, movement is
performed at the FL feedrate, then a stop takes place again at the
position where the reference mark <1> for the slave axis is detected.
Movement starts again at the FL feedrate. Then, each time a reference
mark is detected in the order from master axis (2) to slave axis <2> to
master axis (3), stop and movement at the FL feedrate are repeated.
When the third reference mark <3> for the slave axis has been detected
last, reference position establishment for both axes terminates.
- PMC control axis
In PMC axis control, if the reference position return command (axis
control command code 05H) is issued for an axis having a distance
coded linear scale, reference position return is performed according to
the reference position return sequence for the distance coded linear
scale. Specifically, the following operations take place:
Before reference position
establishment
The reference position is established by
detecting three or four reference marks.
Movement to the reference position is not
performed.
After reference position
establishment
Positioning at the reference position is
performed.