Siemens SINUMERIK 840D sl Function Manual page 687

A preprocessing stop with synchronization is triggered by PRESETON. The actual position is
not assigned until the axis is at standstill.
If the axis is not assigned to the channel at PRESETON, the further procedure depends on the
axis-specific configuration of the axis interchange behavior:
MD30552 $MA_AUTO_GET_TYPE
Referencing status
By setting a new actual value in the machine coordinate system, the referencing status of the
machine axis is reset.
DB31, ... DBX60.4/.5 = 0 (referenced/synchronized measuring system 1/2)
It is recommended that PRESETON only be used for axes that do not require a reference point.
To restore the original machine coordinate system, the measuring system of the machine axis
must be referenced again, e.g. through active referencing from the part program (G74).
Loss of the referencing status
By setting a new actual value in the machine coordinate system with PRESETON, the
referencing status of the machine axis is reset to "not referenced/synchronized".
Programming
Syntax
PRESETON(<axis_1>, <value_1> [, <axis_2>, <value_2>, ... <axis_8>,
<value_8>])
Meaning
PRESETON:
<axis_x>:
<value_x>:
Basic Functions
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
CAUTION
Actual value setting with loss of the referencing status
Preprocessing
stop:
Alone in the block: Yes
Machine axis name
Type:
Range of values: Machine axis names defined in the channel
New actual value of the machine axis in the machine coordinate system
(MCS)
The input is made in the current valid system of units (inch/metric)
An active diameter programming (DIAMON) is taken into account
Type:
K2: Axis Types, Coordinate Systems, Frames
Yes
AXIS
REAL
10.4 Coordinate systems
687