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Commands Calling Axis Movements

2.2 Reference point return

04.07

2-36

SINUMERIK 802D sl/840D/840D sl/840Di/840Di sl/810D ISO Milling (PGM) -- 04.07 Edition

Supplements to the automatic reference point return commands

Tool radius offset and canned cycle

G28 must not be specified in the tool radius offset mode (G41, G42) or in a canned

cycle.

Warning

Issuing G28 will cancel tool radius offset (G40) followed by axes movement to-

wards the reference point. For that reason, make sure to disable tool radius offset

before issuing G28.

Tool position offset

If G28 is specified in the tool position offset mode, positioning at the intermediate

positioning point is made with the offset data valid. However, for the positioning at

the reference point, the offset data are invalid and positioning is made at the abso-

lute reference point.

Tool length offset

It is possible to cancel the tool length offset mode by G28 by changing the setting

for a parameter. Although cancellation of the tool length offset mode is possible by

G28, the tool length offset mode should be canceled before the designation of G28.

Machine lock intervention

The lamp for indicating the completion of return does not go on when the machine

lock is turned on, even when the tool has automatically returned to the reference

position. In this case, it is not checked whether the tool has returned to the refer-

ence position even when a G27 command is specified.

Siemens SINUMERIK 802D sl Programming Manual

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