Basic Parameter Assignment - Siemens SINUMERIK 840D Function Manual

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Table of Contents

R1: Referencing

10.6 Referencing with distance-coded reference marks

Basic parameter assignment

Linear measuring systems.

Figure 10-12

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 reference

mark 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 the

machine system coordinate system:

MD34320 $MA_ENC_INVERS (length measuring system inverse to the machine system)

Rotary measuring system

For rotary measuring systems, the same applies as for linear measuring systems (see above).

Determining the absolute offset

The following procedure is recommended for the determination of the absolute offset between

the 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 = 0

2. Perform reference point approach.

Note: The reference point should be approached at a point in the machine where the exact

position of the machine axis relative to machine zero can be determined easily (using a laser

interferometer, for example).

3. Read the displayed actual position of the machine axis in the machine coordinate system

MCS from the user interface, e.g. SINUMERIK Integrate.

Glass measuring scale with distance-coded reference marks, grid spacing: 20 mm

Axes and spindles

Function Manual, 06/2019, A5E47437747B AA

Sinumerik 840d sl