Siemens SINUMERIK 840D sl Programming Manual page 404

Transformations
6.6 Compression of the orientation (COMPON, COMPCURV, COMPCAD)
Activation/deactivation
Compressor functions are activated using the modal G codes COMPON, COMPCURV or
COMPCAD.
COMPOF terminates the compressor function.
See "NC block compression (COMPON, COMPCURV, COMPCAD) (Page 278) ".
Note
Orientation motion is only compressed when large radius circular interpolation is active (i.e.
tool orientation is changed in the plane which is determined by start and end orientation).
Large radius circular interpolation is executed under the following conditions:
• MD21104 $MC_ORI_IPO_WITH_G_CODE = 0,
• MD21104 $MC_ORI_IPO_WITH_G_CODE = 1 and
404
ORIWKS is active and
the orientation is programmed as a vector (with A3, B3, C3 or A2, B2, C2).
ORIVECT or ORIPLANE is active.
The tool orientation can be programmed either as a direction vector or with rotary axis
positions. If one of the G-codes ORICONxx or ORICURVE is active, or if polynomials for
the orientation angles (PO[PHI] and PO[PSI]) are programmed, no large circle
interpolation will be executed.
Programming Manual, 06/2009, 6FC5398-2BP20-0BA0
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