Siemens SINUMERIK 840D sl Function Manual page 1182

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R1: Referencing

15.9 Referencing with absolute encoders

This determined position value will be made known to the NC as the reference point value.

The NC then calculates the reference point offset from the difference between the encoder

absolute value and the reference point value.

1. Check whether the referencing mode is set to "Assume the reference point value":

MD34200 $MA_ENC_REFP_MODE == 0

If not, enter the value 0 in the machine and trigger a Power On reset.

2. Traverse the machine axis in JOG mode to the position to be measured (e.g. with a laser

interferometer) or to a known position (e.g. fixed stop).

The machine axis can only be traversed in the direction enabled for referencing with the

travel keys:

MD34010 $MA_REFP_CAM_DIR_IS_MINUS (approach reference point in minus direction)

To avoid an invalid position because of backlash in the drive train, the known position must

be approached at low velocity.

3. Enter the position of the machine axis relative to machine zero as the reference point value

in the machine data:

MD34100 $MA_REFP_SET_POS =

4. Enable encoder adjustment:

MD34210 $MA_ENC_REFP_STATE = 1

5. Trigger a Power On reset for acceptance of the entered machine data values.

6. Switch to JOG-REF mode.

Function Manual, 01/2015, 6FC5397-0BP40-5BA2

Basic Functions

Sinumerik 828d Sinumerik 840de sl