Siemens SINUMERIK 840D sl Operating Manual page 62

Setting up the machine
2.2 Approaching a reference point
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3. Select the axis to be traversed.
4. Press the <-> or <+> key.
The selected axis moves to the reference point and stops. The
coordinate of the reference point is displayed.
The axis is marked with
5. Press the "User enable" softkey.
The "User Agreement" window opens.
It shows a list of all machine axes with their current position and SI
position.
5. Position the cursor in the "Acknowledgement" field for the axis in
question.
6. Activate the acknowledgement with the <SELECT> key.
The selected axis is marked with an "x" meaning "safely referenced"
in the "Acknowledgement" column.
By pressing the <SELECT> key again, you deactivate the
acknowledgement again.
.
Operating Manual, 03/2013, 6FC5398-7CP40-3BA1
Milling