Siemens SINUMERIK 840D sl Programming Manual page 399

Further information
G75
The axes are traversed as machine axes in rapid traverse. The motion is mapped internally
using the "SUPA" (suppress all frames) and "G0 RTLIOF" (rapid traverse motion with single-
axis interpolation) functions.
If the conditions for "RTLIOF" (single-axis interpolation) are not met, the fixed point is
approached as a path.
When the fixed point is reached, the axes come to a standstill within the "Exact stop fine"
tolerance window.
G751
The intermediate position is approached with rapid traverse and active offset (tool offset,
frames, etc.), and the axes move with interpolation. The next fixed-point approach is executed
as with G75. Once the fixed point has been reached the offsets are reactivated (as with G75).
Additional axis movements
The following additional axis movements are taken into account at the point at which the G75/
G751 block is interpolated:
• External work offset
• DRF
• Synchronization offset ($AA_OFF)
After this, the additional axis movements are not permitted to change until the end of
traversing is reached by the G75/G751 block.
Additional movements following interpretation of the G75/G751 block will offset the approach
to the fixed point accordingly.
The following additional movements are not taken into account, irrespective of the point at
which interpolation takes place, and will offset the target position accordingly.
• Online tool offset
• Additional movements from compile cycles in the BCS and machine coordinate system
Active frames
All active frames are ignored. Traversing is performed in the machine coordinate system.
Working area limitation in the workpiece coordinate system/SZS
Coordinate-system-specific working area limitation (WALCS0 ... WALCS10) is not effective in
the block with G75/G751. The destination point is monitored as the starting point of the
following block.
Fundamentals
Programming Manual, 09/2011, 6FC5398-1BP40-2BA0
Supplementary commands
14.5 Fixed-point approach (G75, G751)
399