Siemens SINUMERIK 840D sl Programming Manual page 219

Further information
Definition of protection zones
Definition of the protection zones includes the following:
●
●
● Contour description for protection zone
● Termination of the definition with
You can specify a relative offset for the reference point of the protection zone when the
protection zone is activated in the NC part program.
Reference point for contour description
The workpiece-oriented protection zones are defined in the basic coordinate system.
The tool-oriented protection zones are defined with reference to the tool carrier reference
point F.
Permissible contour elements
The following are permissible to define the contour of the protection zone:
●
●
●
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.
Job Planning
Programming Manual, 03/2013, 6FC5398-2BP40-3BA1
for channel-specific protection zones
CPROTDEF
for machine-specific protection zones
NPROTDEF
, for straight contour elements
G0 G1
for clockwise circle segments (only for workpiece-oriented protection zones)
G2
for circular segments in the counterclockwise direction
G3
Note
If a full circle describes the protection zone, it must be divided into two half circles. The
sequence , or ,
G2 G3 G3
necessary.
The last point in the contour description must coincide with the first.
3.1 Defining the protection zones (CPROTDEF, NPROTDEF)
EXECUTE
is not permitted. A short
G2
Protection zones
block must be inserted, if
G1
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