Measurements With Touch Trigger Probe (Meas, Meaw) - Siemens SINUMERIK 840D sl Programming Manual

Special Motion Commands

5.7 Measurements with touch trigger probe (MEAS, MEAW)

Restrictions
The path reference set is of no importance with
• linear and circular interpolation,
• in thread blocks and
• if all path axes are contained in FGROUP.
Description
During polynomial interpolation - and thus the polynomial interpolation is always understood
• in the narrow sense (POLY),
• all spline interpolation types (ASPLINE, BSPLINE, CSPLINE) and
• linear interpolation with compressor (COMPON, COMPCURV)
- are the positions of all path axes i specified by the polynomials pi(U). Curve parameter U
moves from 0 to 1 within an NC block, therefore it is standardized.
The axes to which the programmed path feed is to relate can be selected from the path axes
by means of language command FGROUP. However, during polynomial interpolation, an
interpolation with constant velocity on path S of these axes usually means a non constant
change of curve parameter U.
Control behavior for reset and machine/option data
After reset, MD 20150: GCODE_RESET_VALUES [44] makes certain G codes effective
(45th G code group).
The initial state for the type of the smoothing is specified with MD 20150:
GCODE_RESET_VALUES [9] (10th G code group).
The G code group value active after Reset is determined via machine data MD 20150:
GCODE_RESET_VALUES [44]. In order to maintain compatibility with existing installations,
SPATH is set as default value.
The axial machine dataMD 33100: COMPRESS_POS_TOL have an extended meaning: They
contain the tolerances for the compressor function and for rounding with G642.
5.7 Measurements with touch trigger probe (MEAS, MEAW)
5.7
Function
The positions coinciding with the switching edge of the probe are acquired for all axes
programmed in the NC block and written for each specific axis to the appropriate memory
cell. Maximum two probes exist.
5-24
Programming Manual, 03/2006 Edition, 6FC5398-2BP10-1BA0
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