7. POSITIONING CONTROL
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7.21.3
Zeroing by the count method
(1) Count method
Using the count method, the home position is the first zero point after a
designated distance (travel value after proximity dog turns ON) after the
proximity dog turns ON.
The travel value after the proximity dog turns ON is set in the table of
zeroing data shown in section 7.21.1.
(2) Zeroing by the count method
The zeroing operation using the count method is shown in Fig. 7.33.
ON
Zeroing start
Zeroing speed
Creep speed
Zero point
Zeroing direction
Proximity dog
V
t
∗
After the proximity dog turns ON,
positioning by the travel value after the
proximity dog set in the zeroing
data turns ON is excutedd.
Positioning is carried out from this
position to the zero point.
The distance to the zero point is
determined from the servo data.
The travel value in this range is stored in
the monitoring register:
Travel value after proximity dog
turns ON.
The travel value in this range is stored in
the monitoring register:
Zeroing second travel value.
Fig. 7.34 Operation of Zeroing by the Count Method
(3) Running zeroing
To run zeroing, use the servo program described in Section 7.21.5.
(4) Cautions
(a) Maintain sufficient distance between the position where the proximity
dog turns OFF and the home position.
(b) Using the count method, zeroing or resumptive start of zeroing is
possible when the proximity dog turns ON. To carry out zeroing or
resumptive start of zeroing when the proximity dog turns ON, return the
axis to a position where the proximity dog is OFF before starting the
zeroing.
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