Tolerance Parameters: _Tzl, _Tmv, _Tul, _Tll, _Tdif And _Tsa - Siemens SINUMERIK 840D sl Programming Manual

2.3.11

Tolerance parameters: _TZL, _TMV, _TUL, _TLL, _TDIF and _TSA

In the "General section, measuring principle" chapter, the correction strategy of measuring
cycles is explained and a description of the effect of the parameters given.
Parameter
Parameter
_TZL
_TMV
_TUL/_TLL
_TDIF
_TSA
_TZL
1) For workpiece measurement with automatic tool offset only
2) Also for tool measurement
Range of values
All of these parameters can have any value. However, only values increasing from _TZL to
_TSA are meaningful (absolute values). Parameters _TUL/_TLL are specified in mm or
inches depending on the active dimension system and are signed. All other parameters are
programmed in the basic system.
Making the workpiece tolerance and setpoint symmetrical
If asymmetrical values are chosen for the tolerance parameters _TUL, _TLL (workpiece
tolerance), the setpoint (_SETVAL) is corrected internally to place it in the center of a new,
symmetrical tolerance band. These changed values appear in the result parameters: OVR[0]
– setpoint, OVR[8] – upper tolerance limit, OVR[12] – lower tolerance limit.
The defining parameters themselves (_TUL, _TLL, _SETVAL) remain unchanged.
Example
_TUL=0.0 _TLL=-0.004 _SETVAL=10
The result is:
OVR[8]=0.002 OVR[12]=-0.002 OVR[0]=9.998
Measuring cycles
Programming Manual, Release 04/2006, 6FC5398-4BP10-0BA0
2.3 Description of the most important defining parameters
Data type Meaning
REAL ³0 Zero offset
1)2)
REAL >0 Mean value generation with compensation
REAL Workpiece tolerance
REAL >0 Dimension difference check
REAL >0 Safe area
REAL ³0 Zero offset
1)2)
1)
1)
1)2)
Parameter description
2-15