Festo Кабели и принадлежности - Manual (Page 326)

7. Description of the commands
7−60
Festo P.BE−SPC200−EN en 0901d
Mode Description
0 The reference point is set at the current position.
Ĉ The status flag REF will be set immediately.
Ĉ There are no restrictions as regards the speed and acceleration limit values
(compare with mode 7).
This mode may only be used if you can be sure that the axis actually stands at the
planned reference position.
For example, you can move program−controlled to the defined end stop with NC comĆ
mand M39, monitor the reaching of the position with the aid of a proximity switch and
finally accept the reference point with mode 0.
Example
N000 #TF64 7 ;REF flag of the X–axis set?
N001 M40 X0 ;Cancel all limit value monitorings re. M39
;(stroke and speed limit
;values)
N002 M39 X45 ;Switch off controller and open valve
;statically in the direction smaller
;position values.
N003 #TNI0.0 3 ;Test input I0.0 (reference switch)
;for 0, until stop is reached
;(I0.0 = 1)
N004 G04 50 ;Wait 500 ms
N005 M12 X ;Activate controller again
N006 G74 X0 ;Set reference point
N007 ...
5 Reference travel in negative direction (retract piston rod up to rear stop or cylinder
cover).
Ĉ As soon as the axis stands still, the reference point is set.
Ĉ The status flag REF will be set immediately.
6 Reference travel in positive direction (extend piston rod up to front stop or bearing
cover).
Ĉ As soon as the axis stands still, the reference point is set.
Ĉ The status flag REF will be set immediately.