Siemens Sinumerik 840D sl Programming Manual page 260

Tool radius compensation
11.2 Approaching and leaving contour (NORM, KONT, KONTC, KONTT)
NOTICE
Risk of collision
Modified approach/retract angles must be taken into account during programming in order
that potential collisions can be avoided.
Approach/retraction with KONT
Prior to the approach, the tool can be located in front of or behind the contour. The path tangent
at the starting point serves as a separation line:
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Programming Manual, 01/2015, 6FC5398-1BP40-5BA2
Fundamentals