Siemens SINUMERIK 840D sl Programming Manual page 354

Measuring Cycles for Turning Machines
6.5 CYCLE974 workpiece: 1-point measurement
Note
The values of the workpiece tolerance parameters _TUL, _TLL were selected asymmetrically
in the example. The result is then made symmetrical (see Section "Tolerance parameters:
_TZL, _TMV, _TUL, TLL, _TDIF and _TSA").
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Programming Manual, Release 04/2006, 6FC5398-4BP10-0BA0
Measuring cycles