Enhanced Level Commands
4.1 Program support functions (1)
04.07
4-96
© Siemens AG 2007 All rights reserved
SINUMERIK 802D sl/840D/840D sl/840Di/840Di sl/810D ISO Milling (PGM) -- 04.07 Edition
Note
By applying GUD7 setting data _ZSFI[0], it can be decided whether the Z axis
should always be used as the drilling axis. The Z axis always represents the dril-
ling axis whenever _ZSFI[0] equals 1.
Canned cycle execution
The execution of canned cycles is determined as follows:
1. Cycle call
G73, 74, 76, 81 through to 89
depending on the desired machining
2. Data format G90/91
G90 (Absolute Command) G91 (Incremental Command)
Point R
Point Z
R
Z
Z=0
Point R
Point Z
R
Z
Fig. 4-3 Absolute / incremental command G90/G91
3. Drilling mode
G73, G74, G76, and G81 through to G89 are modal G codes and remain effec-
tive until canceled. When they are applied, the drilling mode is the current state.
The data is retained until modified or canceled, once the drilling data is determi-
ned within the drilling mode,
At the beginning of canned cycles, determine all required drilling data. Only de-
termine the data modifications whenever the canned cycles are being carried
out.
4. Positioning / reference level (G98/G99)
When using canned cycles, the retraction level for the Z axis is determined
through G98/99. G98/G99 are modal G codes. G98 is usually set as power--on
default.
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