Siemens Sinumerik 840D sl Programming Manual page 232

Protection zones
3.1 Definition of the protection zones (CPROTDEF, NPROTDEF)
External protection zones
External protection zones (only possible for workpiece-related protection zones) must be
defined in the clockwise direction.
Protection zones symmetrical around the center of rotation
For protection zones symmetrical around the axis or rotation (e.g. spindle chuck), you must
describe the complete contour and not only up to the center of rotation!
Tool-related protection zones
Tool-related protection zones must always be convex. If a concave protected zone is desired,
this should be subdivided into several convex protection zones.
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Programming Manual, 02/2011, 6FC5398-2BP40-1BA0
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