Siemens SINUMERIK 840D sl Function Manual page 786

Positioning Axes (P2)
11.6 Block change
In the technology cycle:
FINEA
POS[X]=100
ADISPOSA(X,2,0.3)
IPOBRKA(X,100)
POS[X]=200
POS[X]=250
N40 POS[X]=250
POS[X]=0
M17
786
; End of motion criterion fine exact stop
; Technology cycle block change takes place
; when the X axis has reached position 100
; and exact stop fine.
; Define tolerance window actual position for
; X axis as 0.3
; Activate block change criterion braking ramp
; Technology cycle block change takes place
; as soon as the X axis starts to brake and
; the X axis actual position is ≥ 199.7.
; X axis does not brake at position 200,
; but continues moving
; to position 250, as soon as the X axis
; begins to brake and reaches position
; ≥ 249.7, the block changes in the
; technology cycle.
; the X axis brakes and traverses back
; to position 0
; the block change occurs at position 0
; and exact stop fine.
Function Manual, 01/2008, 6FC5397-1BP10-3BA0
Extended Functions