Siemens SINUMERIK 840D sl Function Manual page 690

K2: Axis Types, Coordinate Systems, Frames
10.4 Coordinate systems
Axis couplings
● Leading axes: The sudden change of the leading axis position caused by PRESETON is not
traversed in the following axes. The coupling is not changed.
● Following axes: Only the overlaid position component of the following axis is affected by
PRESETON.
Gantry grouping
● If PRESETON is used on the guide axis of a gantry grouping, the work offset is also performed
in all synchronized axes of the gantry grouping.
Indexing axes
● PRESETON can be used on indexing axes.
Software limit switches, operating range limit, protection areas
● If the axis position is outside the specified limits after a work offset by PRESETON, an alarm
is not displayed until an attempt is made to traverse the axis.
Block search with calculation
PRESETON commands are collected during the block search and executed with the NC start
to continue the NC program.
Position-dependent NC/PLC interface signals
● The status of the position-dependent NC/PLC interface signals is redetermined based on
the new actual position.
Example: Fixed point positions
– Parameterized fixed point positions: MD30600 $MA_FIX_POINT_POS[0...3] = <fixed
– NC/PLC interface signals DB31, ... DBX75.3 ... 5 (JOG approach fixed point reached)
If the axis is at a fixed point position with the exact stop tolerance, the associated NC/PLC
interface signal is set. The NC/PLC interface signal is reset when the actual value is set by
PRESETON to a different value outside the exact stop tolerance around the fixed point
position.
DRF offset
● A DRF offset of the axis is deleted by PRESETON.
Overlaid movement $AA_OFF
● An overlaid movement from a synchronized action with $AA_OFF is not affected by
PRESETON.
Online tool offset FTOC
● An active online tool offset from a synchronized action with FTOC remains active even after
PRESETON.
Axis-specific compensations
Axis-specific compensations remain active after PRESETON.
690
point position 1...4>
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
Basic Functions