Siemens SINUMERIK 802D sl Programming And Operating Manual page 30

Turning on, reference point approach
Press the arrow keys.
If you select the wrong approach direction, no motion is carried out.
One after the other, move each axis to the reference point.
You can exit the function by selecting another operating mode (MDA, AUTOMATIC or JOG).
To access the functions described below, you need to select "Jog" mode.
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Programming and Operating Manual, 11/2012, 6FC5398-5CP10-3BA0
Surface grinding