Siemens SINUMERIK 840D sl Function Manual page 784

Positioning Axes (P2)
11.6 Block change
Note
For further information about programming positioning axes, see:
References:
/PG/ Programming Manual, Fundamentals, Section "Feedrate control and spindle motion"
/PGA/, Programming Manual, Advanced, Section "Special motion commands"
Examples
For block change condition "Braking ramp" in the part program:
N10 POS[X]=100
N20 IPOBRKA(X,100)
N30 POS[X]=200
N40 POS[X]=250
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:
784
; Default effective
; Block change occurs when the X axis reaches
; position 100 and exact stop fine.
; Braking ramp block change condition
; Block change occurs as soon as the X axis
; begins to brake
; X axis does not brake at position 200,
; but continues moving
; to position 250, as soon as the X axis
; begins to brake, the block changes.
; the X axis brakes and traverses back
; to position 0, the block change
; takes place at position 0 exact stop fine
Function Manual, 01/2008, 6FC5397-1BP10-3BA0
Extended Functions