Siemens SINUMERIK 840D sl Programming Manual page 246

Protection zones
3.1 Definition of the protection zones (CPROTDEF, NPROTDEF)
Tool-related protection zones must always be convex. If a concave protected zone is
desired, this should be subdivided into several convex protection zones.
Constraints
During definition of the protection zones:
● no cutter or tool nose radius compensation must be active
● no transformation must be active
● no frame must be active.
Nor must reference point approach (G74), fixed point approach (G75), block search stop or
program end be programmed.
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Programming Manual, 06/2009, 6FC5398-2BP20-0BA0
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