6 POSITIONING CONTROL

6.23.13 Home position return retry function

When a work has been exceeded home position during positioning control, etc., even if it executes the home position return, depending on the position of work, a work may not travel to home position direction. In this case, a work is normally travelled before the proximity dog by the JOG operation, etc, and the home position return is started again. However, by using the home position return retry function, even if a work is where, the home position return can be executed.

Refer to Section 6.23.1(7) for home position return method by using the home position return retry function.

[Data Setting]

When the "home position return retry function" is used, set the following "home position return data" using a peripheral devices.

Set the "dwell time at the home position return retry" as required. Set the parameters for every axis.

Table 6.4 Home position return data

Items

Setting details

Setting

Initial value

value

 

 

 

 

 

 

 

 

0 : Invalid (Do not execute the home position

 

 

Home position return

return retry by limit switch.)

0, 1

0

retry function

1 : Valid (Execute the home position return

 

 

 

retry by limit switch.)

 

 

Dwell time at the home

The stop time at the deceleration stop during

0 to 5000

0

position return retry

the home position return retry is set

[ms]

 

 

 

 

 

[Control details]

Operation for the home position return retry function is shown below.

(1)Home position return retry operation setting a work within the range of external limit switch

Acceleration time

 

Deceleration time

 

 

 

 

 

 

 

 

Home position

 

 

return direction

 

 

5)

6)

1)

2)

 

 

 

 

 

 

 

 

 

 

4)

 

Home

Home position

 

 

position

return start

 

 

 

 

3)

 

External limit switch Proximity dog

Zero point

1)It travels to preset direction of home position return.

2)If the external upper/lower limit switch turns OFF before the detection of proximity dog, a deceleration stop is made.

3)After a deceleration stop, it travels to reverse direction of home position return with the home position return speed.

4)A deceleration stop is made by the proximity dog OFF.

5)After a deceleration stop, it travels to direction of home position return.

6)Home position return ends.

Fig. 6.44 Operation for home position return retry (proximity dog type)

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