Siemens SINUMERIK 840D sl Function Manual

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15.6.2 Basic parameter assignmentLinear measuring systems.The following data must be set to parameterize linear measuring systems:● The absolute offset between the machine zero point and the position of the first referencemark of the linear measuring system:MD34090 $MA_REFP_MOVE_DIST_CORR (reference point/absolute offset)See also below: Determining the absolute offset● Orientation of the length measuring system (equidirectional or inverse) relative to themachine system coordinate system:MD34320 $MA_ENC_INVERS (length measuring system inverse to the machine system)5HIHUHQFHPDUNFigure 15-12 DIADUR graduated glass scale with distance-coded reference marks(dimensions in mm for 20 mm scale division)Rotary measuring systemFor rotary measuring systems, the same applies as for linear measuring systems (see above).Determining the absolute offsetThe following procedure is recommended for the determination of the absolute offset betweenthe machine zero point and the position of the first reference mark of a machine axis:1. Enter the value zero for the absolute offset:MD34090 $MA_REFP_MOVE_DIST_CORR = 02. Perform reference point approach.Note:Reference point approach should be performed at a point in the machine where theexact position of the machine axis relative to machine zero can be determined easily witha laser interferometer, for example.3. Determine the actual position of the machine axis via the operator interface screen.4. Measure the current position of the machine axis with reference to the machine zero point.5. Calculate absolute offset and enter in MD34090.R1: Referencing15.6 Referencing with distance-coded reference marksBasic Functions1168 Function Manual, 01/2015, 6FC5397-0BP40-5BA2