Siemens SINUMERIK 840D sl Programming Manual page 577

Additional information
Machine-specific protection zones
A machine-specific protection zone or its contour is defined using the geometry axis, i.e.
referenced to the basic coordinate system (BCS) of a channel. In order that correct protection-
zone monitoring can take place in all channels in which the machine-specific protection zone
is active, the basic coordinate system (BCS) of all of the channels involved must be identical:
● position of the coordinate origin referred to the machine zero
● Orientation of the coordinate axes
Reference point for contour description
● Tool-related protection zones
Coordinates for tool-related protection zones must be specified as absolute values referred
to the tool holder reference point F.
● Workpiece-related protection zones
Coordinates for workpiece-related protection zones must be specified as absolute values
referred to the zero point of the basic coordinate system (BCS).
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 the contour 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.
①
②
F
NC programming
Programming Manual, 12/2019, 6FC5398-2EP40-0BA0
Convex protection zones
Concave protection zones (not permissible!)
Toolholder reference point
Work preparation
3.6 Protection zones
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