Siemens SINUMERIK 840Di sl Programming Manual page 379

Further information
The approach behavior is symmetrical to the retraction behavior.
The approach/retraction behavior is determined by the state of the G command in the
approach/retraction block. The approach behavior can therefore be set independently of the
retraction behavior.
Example of retraction behavior with G460
The following example describes only the situation for deactivation of tool radius
compensation. The behavior for approach is the same.
G42 D1 T1
...
G1 X110 Y0
N10 X0
N20 Y10
N30 G40 X50 Y50
Example of approach with G461
N10 $TC_DP1[1,1]=120
N20 $TC_DP6[1,1]=10
N30 X0 Y0 F10000 T1 D1
N40 Y20
N50 G42 X50 Y5 G461
N60 Y0 F600
N70 X30
N80 X20 Y-5
N90 X0 Y0 G40
N100 M30
Fundamentals
Programming Manual, 11/2006, 6FC5398-1BP10-2BA0
8.11 Smooth approach and retraction
;Tool radius 20mm
;Tool type: milling tool
;Tool radius
Tool offsets
379