Siemens Sinumerik 840D sl Programming Manual page 359

Note
If the "Tool management with magazines" function is active, the auxiliary function T... or
M... (typically M6) will not be sufficient to trigger a block change inhibit at the end of G75
motion.
Reason: If "Tool management with magazines" is active, auxiliary functions for tool change
are not output to the PLC.
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.
Parameterizable dynamic response for G75
The required dynamic response mode can be set via the following machine data for positioning
movements to fixed-point positions (G75):
MD18960 $MN_POS_DYN_MODE (type of positioning axis dynamic response)
References
Function Manual, Basic Functions, Chapter "Acceleration (B2)" > "Functions" > "Jerk limiting
for single axis interpolation (SOFTA) (axis-specific)"
Additional axis movements
The following additional axis movements are taken into account at the instant in time at which
the G75 block is interpolated:
● External zero offset
● DRF
● Synchronization offset ($AA_OFF)
After this, the additional axis movements are not permitted to change until the end of traversing
is reached by the G75 block.
Additional movements following interpretation of the G75 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
Fundamentals
Programming Manual, 01/2015, 6FC5398-1BP40-5BA2
Supplementary commands
15.5 Approaching a fixed point (G75)
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