Siemens SINUMERIK 840D sl Function Manual page 215

Tool modeling
The model of a tool is created by the control heuristically from the tool data. The tool data used
for this (L1, L2, L3, R) is always the the overall dimensions resulting from the individual
components, e.g. length plus wear, as is also entered in the program processing for tool offset.
Programmable tool offsets
Programmable tool offsets such as OFFN (offset to the programmed contour) are not taken
into account as they may change in any block, even without a tool change.
Special functions
Function Manual, 01/2015, 6FC5397-2BP40-5BA2
K8: Geometric machine modeling - only 840D sl
6.1 Function description
215