Siemens Sinumerik 840D sl Programming Manual page 493

Approaching with a new tool
The following applies if you have stopped the program run due to tool breakage:
When the new D number is programmed, the machining program is continued with modified
tool offset values at the repositioning point.
Where tool offset values have been modified, it may not be possible to reapproach the
interruption point. In such cases, the point closest to the interruption point on the new contour
is approached (possibly modified by DISPR).
Job planning
Programming Manual, 02/2011, 6FC5398-2BP40-1BA0
8.6 Repositioning to a contour (REPOSA, REPOSL, REPOSQ,
Path traversing behavior
493