Siemens SINUMERIK 840D sl Function Manual page 886

Rotary Axes (R2)
Programming rotary axes
Z500
G0 Z540 B0
M124
STOPRE
B270
Incremental programming (IC, G91)
Example for positioning axis: POS[axis name] = IC(+/-value)
● The value identifies the rotary-axis traversing distance. The value can be negative and ≥
● The value's sign unequivocally defines the rotary-axis traversing direction.
● Application example: milling a spiral groove across several revolutions
Example:
Programming
POS[C] = IC(720)
POS[C] = IC(-180)
Endless traversing range
As soon as the modulo function is active, no limit is placed on the traversing range (software
limit switches are not active). The rotary axis can now be programmed to traverse
continuously.
Example:
LOOP:
POS[C] = IC(720)
GOTOB LOOP
886
+/-360°.
;
;
;
Effect
C axis traverses to 720° incrementally in the positive direction
(two revolutions)
C axis traverses to 180° incrementally in the negative direction
Function Manual, 03/2009, 6FC5397-1BP10-4BA0
Insert the pallet with built-on
axis into the machine
Activate the software limit
switches on the B axis from the
PLC
DB35, DBX12.4=1
Trigger a preprocessing stop
Extended Functions