Siemens SINUMERIK 840D sl Function Manual page 796

P2: Positioning axes
11.6 Block change
N50 POS[X]=0
N60 X10 F100
N70 M30
At direction reversal (N50), the axis first brakes to reach the target position, before it can be
traversed in the opposite direction.
Alternatively, IPOBRKA(X) can also be written in block N20 if the value 100 has already
been entered in
SD43600 $SA_IPOBRAKE_BLOCK_EXCHANGE[AX1].
For block change condition "Braking ramp" in synchronized action:
In the technology cycle:
FINEA
POS[X]=100
IPOBRKA(X,100)
POS[X]=200
POS[X]=250
N40 POS[X]=250
POS[X]=0
M17
With tolerance window
For block change condition "Braking ramp" in the part program:
N10 POS[X]=100
N20 IPOBRKA(X,100)
N21 ADISPOSA(X,1,0.5)
N30 POS[X]=200
N40 POS[X]=250
796
; the X axis brakes and traverses back
; to position 0, the block change
; takes place at position 0 exact stop fine
; 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.
; Activate block change criterion braking ramp
; Technology cycle block change takes place
; as soon as X axis starts to brake.
; X axis does not brake at position 200,
; but continues traversing to position 250
; As soon as the X axis starts to brake,
; the block change occurs in the technology cycle.
; The X axis brakes and returns to position 0
; the block change takes place at position 0 exact stop fine.
; Default effective
; Block change occurs when the X axis reaches
; position 100 and exact stop fine.
; Braking ramp block change condition
, Define tolerance window setpoint position for X axis
; as 0.5
; Block change occurs as soon as the X axis
; begins to brake and the
; setpoint position is ≥ 199.5.
; X axis does not brake at position 200,
; but continues traversing to position 250,
; as soon as the X axis starts to brake,
; and the position is ≥ 249.5,
; the block change takes place.
Function Manual, 09/2009, 6FC5397-1BP20-0BA0
Extended Functions