System Variables; Supplementary Conditions - Siemens SINUMERIK 840D sl Function Manual

W1: Tool offset
2.5 2D tool radius compensation
Figure 2-11
2.5.4.4

System variables

Points P
$P_APR:
$P_AEP:
$P_APDV
Changing the WCS between the SAR block and the read operation has no effect on the position
values.
2.5.4.5

Supplementary conditions

Supplementary conditions
● Any further NC commands (e.g. auxiliary function outputs, synchronous axis movements,
positioning axis movements, etc.) can be programmed in an SAR block.
These are executed in the first subblock on approach and in the last subblock on retraction.
● If the end point P
the actual SAR contour (straight line, quadrant or semicircle) is traversed in this block.
The last subblock of the original SAR block does not then contain traversing information for
geometry axes. It is always output, however, because further actions (e.g. single axes) may
have to be executed in this block.
66
Velocities in the SAR subblocks on retraction
and P can be read in the WCS as system variables during approach.
3 4
Read P (start point) in WCS
3
Read P (contour start point) in WCS
4
=1 If the content of $P_APR and $P_AEP is valid, i.e., if these contain the position
values belonging to the last SAR approach block programmed.
=0 The positions of an older SAR approach block are read.
is not taken from the SAR block but from a subsequent traversing block,
4
Function Manual, 06/2019, A5E47435126B AA
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