Siemens SINUMERIK 808D Programming And Operating Manual page 125

Zp: Z axis or an axis parallel to the Z axis
Note
Whether the Z axis should always be used as the drilling axis can be defined with USER DATA, _ZSFI[0]. The Z axis is then
always the drilling axis, if _ZSFI[0] is equal to "1".
Execution of a fixed cycle
The following is necessary to execute a fixed cycle:
1. Cycle call
G73, 74, 76, 81 to 87 and 89
as a function of the desired machining
2. Data format G90/91
Absolute/incremental command G90/G91:
3. Drilling mode
G73, G74, G76 and G81 to G87 and 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.
4. Positioning/reference plane (G98/G99)
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.
Programming and Operating Manual (ISO Turning/Milling)
01/2017
125