Siemens Sinumerik 840D sl Programming Manual page 77

3. Drilling mode
4. Positioning/reference plane (G98/G99)
Figure 4-3
Repeat
If several holes are drilled at uniform spacing, the number of repetitions is specified with "K".
"K" is effective only in the block in which it is programmed. If the drilled hole position is
programmed as absolute (G90), drilling is done at the same position again; hence the drilled
hole position is to be specified as incremental (G91).
Comments
A cycle call remains active till it is deselected again with the G functions G80, G00, G01,
G02 or G03 or another cycle call.
ISO Milling
Programming Manual, 06/09, 6FC5398-7BP10-1BA0
G73, G74, G76 and G81 to G89 are modal G functions and they remain active till they
are deselected. The selected drilling cycle is called in each block. The complete
parameter assignment of the drilling cycles must be programmed only during the
selection (e.g., G81). Only the parameters that are supposed to change are to be
programmed In the following blocks.
While using the fixed cycles, the retraction plane for the Z-axis is defined with G98/99.
G98/G99 are modal G functions. The closed position is normally G98.
Plane for the return point (G98/G99)
Additional functions
4.1 Program supporting functions
77