Actual Value Setting With Loss Of The Referencing Status (Preseton) - Siemens SINUMERIK 840D sl Function Manual

K2: Axis Types, Coordinate Systems, Frames
10.4 Coordinate systems
Figure 10-13 MCS with machine axes X, Z (turning machine)
Axial preset offset
The reference point of the control in the machine coordinate system (machine zero) can be
reset via the "Preset offset (PRESETON)" function.
Loss of the encoder adjustment
After a preset offset, the appropriate machine axis is in the "Not referenced" state! This means
that when using absolute encoders, the encoder adjustment is lost and must be performed
again (e.g. by calibration with a laser interferometer ). The use of PRESETON in combination
with absolute encoders is therefore not recommended.
Note
We recommend that the function is only used for machine axes that do not require a reference
point.
In order to restore the original machine coordinate system, the machine axis must be re-
referenced, e.g. with G74 (reference point approach).
The machine axes are not moved with the preset offset.
References
● Programming Manual, Fundamentals
Section: "Supplementary commands" > "Reference point approach (G74)"
● Programming Manual, Job Planning
Section: "Coordinate transformations (FRAMES)" > "Preset offset (PRESETON)
10.4.2.1

Actual value setting with loss of the referencing status (PRESETON)

Function
The PRESETON() procedure sets a new actual value for one or more axes in the machine
coordinate system (MCS). This corresponds to work offset of the axis MCS. The axis is not
traversed.
686
CAUTION
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
Basic Functions