Siemens SINUMERIK 840D sl Programming Manual page 569

Further information
Read tolerance values
For more advanced applications or for diagnostics, the currently valid tolerances for the
compressor functions (COMPON, COMPCURV, COMPCAD), the smoothing types G642,
G643, G645, OST, and the orientation smoothing ORISON can be read via system variables
irrespective of how they might have come about.
● In synchronized actions or with preprocessing stop in the part program via system
Job Planning
Programming Manual, 06/2009, 6FC5398-2BP20-0BA0
8.8 Programmable contour/orientation tolerance (CTOL, OTOL, ATOL)
variables:
$AC_CTOL
$AC_OTOL
$AA_ATOL[<axis>]
Contour tolerance effective when the current main
run record was preprocessed.
If no contour tolerance is effective, $AC_CTOL will
return the root from the sum of the squares of the
tolerances of the geometry axes.
Orientation tolerance effective when the current main
run record was preprocessed.
If no orientation tolerance is effective, $AC_OTOL will
return the root from the sum of the squares of the
tolerances of the orientation axes during active
orientation transformation. Otherwise, it will return
the value "-1".
Axis tolerance effective when the current main run
record was preprocessed.
If no contour tolerance is active,
$AA_ATOL[<geometry axis>] will return the
contour tolerance divided by the root of the number
of geometry axes.
If an orientation tolerance and an orientation
transformation are active
$AA_ATOL[<orientation axis>] will return the
orientation tolerance divided by the root of the
number of orientation axes.
Path traversing behavior
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