Siemens SINUMERIK 840D sl Function Manual page 570

Kinematic Transformation (M1)
Cartesian PTP travel
● With PTPG0, CP travel is used for smooth approach and retraction (SAR).
● PTP does not permit cutting cycles like CONTPRON, CONTDCON
● When PTPG0 is selected, the CP command is applied in cutting cycles such
● Chamfer and rounding are ignored.
● An axis override in the interpolation must not change during the PTP contour section.
In PTP blocks
● compressor is automatically deselected because it is not compatible with PTP.
● G643 is automatically switched over to G642.
● Transformation axes must not be configured simultaneously as positioning axes.
Special points to be noted
Please take account of the following basic rules with respect to the basic coordinate system:
● Smoothing G642 is always interpreted in the machine coordinate system and not (as
● G641 determines the smoothing action as a function of the fictitious path calculated from
● An F value input with G1 refers to the fictitious path calculated from the machine axis
Block search
TRANSMIT during block search can result in different machine axis positions for the same
Cartesian position, if a program section is executed with block search.
Interrupts
An illegal action, which may result in a conflict, is rejected with the following alarms:
Alarm 14144: If TRC is selected or activated in PTP. Likewise in PTP with soft approach and
retraction (SAR) or PTP without the required G0 and G1 blocks.
Alarm 10753: With PTPG0 and active TRC an internal switch-over to CP is done in order to
allow the tool radius correction to be performed correctly.
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SAR requires a contour in order to construct approach and retraction motion and to be
able to lower and raise tangentially. The blocks required for this purpose are therefore
traversed with the CP command. The G0 blocks up to the actual approach contour are
executed with PTP and therefore quickly. The same applies to the retract blocks.
Stock removal cycles require a contour to construct the cut segmentation. This
information is not available with PTP. Alarm 10931 "Error in cut compensation" is
generated in response.
asCONTPRON, CONTDCON. Stock removal cycles require a contour to construct the cut
segmentation. The blocks required for this purpose are traversed with the CP command.
This applies, for example, to LIFTFAST, fine tool offset, coupled motion TRAILON and
tangential follow-up TANGON.
usual) in the cartesian basic coordinate system.
the machine axis coordinates.
coordinates.
Function Manual, 03/2009, 6FC5397-1BP10-4BA0
Extended Functions