Siemens SINUMERIK 840D sl Function Manual page 1582

Detailed description
2.6 Referencing with absolute value encoders
2.6.2 Calibration by entering a reference point offset
Function
During adjustment by entering the reference point offset, the difference between the position
displayed on the operator interface and the true actual position in the machine is determined
and made known to the NC as reference point offset.
Procedure
1. Determining the position of the machine axis with reference to the machine zero point via
2. Reading the displayed actual position of the machine axis on the operator interface.
3. Calculating the reference point offset (difference between the actual positions determined
4. Marking the absolute value encoder as adjusted:
Note
The encoder adjustment does not become active until the next time the encoder is
activated (e.g., when the controller is powered up).
5. Initiate POWER ON reset.
6. Controlling the position of the machine axis displayed on the operator interface.
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e.g.:
– position measurement (e.g. laser interferometer)
– Moving the machine axis to a known position (e.g., fixed stop)
under point 1 and 2) and entering in machine data:
MD34090 $MA_REFP_MOVE_DIST_CORR (reference point offset)
MD34210 $MA_ENC_REFP_STATE = 2
Basic logic functions: Reference Point Approach (R1)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0