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7 AUXILIARY AND APPLIED FUNCTIONS
7.3.5 Home position return by the count type 2
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(1) Count type 2
After the proximity dog ON, the position which traveled the specified distance
(travel value after proximity dog ON) is home position in this method.
(If the proximity dog signal of servo amplifier is used, the count type 2 home
position return cannot be executed.)
It is not related for zero point pass or not pass.
A count type 2 is effective method when a zero point signal cannot be taken.
(However, dispersions will occur to the stop position at the home position return
compared with the count type 1.)
The travel value after proximity dog ON is set in the home position return data
(Refer to Section 7.3.1).
(2) Home position return by the count type 2
Operation of home position return by count type 2 is shown below.
V
Home position
return direction
t
Home position
return speed
Creep speed
Home position
return start
Proximity dog
The travel value in this range is stored in the
monitor register "travel value after proximity
dog ON".
(Note): "Home position return re-travel value" = 0
(Note): After the proximity dog ON, a position
which traveled the distance " travel
value after proximity dog ON" of the
home position return data is home
position.
Fig. 7.7 Home position return operation by the count type 2
(3) Home position return execution
Home position return by the count type 2 is executed using the CHGA instruction
in Section 7.3.16.
When the home position return request is ON, the count type 2 home position
return is also made even G28 of the Motion program.