Siemens Sinumerik 802D sl Programming Manual page 48

Commands Calling Axis Movements
2.3 Reference point return
Reference point return operation
Reference point return operation is the series of operations in which the axes re-
turn to the reference point after the reference point return operation has been star-
ted manually.
The reference point return is executed in the following manner.
S After the positioning at the intermediate positioning point B, the axes return
directly to the reference point at a rapid traverse rate. The axes can be returned
to the reference point in a shorter time compared to the normal reference point
return operation that uses a deceleration limit switch for the individual axes.
S Even if point B is located outside the area in which reference point return is
allowed, the reference point return specification allows the axes to return to the
reference point.
S Automatic reference point return is valid only when reference point return is
called by G28, and it does not influence manual reference point return opera-
tion.
Notice
Before specifying the G28 command, the tool position offset mode and nose R off-
set mode should be canceled. If the G28 command is specified without canceling
these modes, they are canceled automatically.
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SINUMERIK 802D sl/840D sl840D/840Di sl/840Di/810D ISO Turning -- 04.07 Edition
© SIEMENS AG 2007 All rights reserved
04.07