Siemens SINUMERIK 840D sl Function Manual page 701

Basic offset
The basic offset describes the coordinate transformation between BCS and BZS. It can be
used, for example, to define the palette window zero.
The basic offset comprises:
● Zero offset external
● DRF offset
● Superimposed motion
● Chained system frames
● Chained basic frames
Figure 10-17 Example of the use of the basic offset
The following settings apply:
● The user can change the basic offset from the part program by means of an operator action
and from the PLC.
● If the basic offset is to take effect immediately, an ASUB can be started via the PLC using
FC9 in order to execute the appropriate G code.
Note
Recommendation to the machine manufacturer
Use the 3rd basic offset onwards for your own applications.
The 1st and 2nd basic offset are reserved for PRESET and the "Zero offset external".
Basic Functions
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
K2: Axis Types, Coordinate Systems, Frames
10.4 Coordinate systems
701