Siemens SINUMERIK 840C Installation Instructions Manual page 881

12 Functional Descriptions
12.13.3 Explanation of indexing function terms
Example:
Number of divisions = 6
Rotary axis Division reference dimension= 360 · 10
This offset becomes active as soon an the machine data has been altered.
Incremental division in the specified direction of rotation: (G91)
The indexing axis moves from the current indexing position by the number of division specified
by the division number. The division number can be larger than the number of divisions.
Absolute division in the specified direction of rotation: (G90)
Rotary axis: The indexing axis is positioned to the defined division number within 360
degrees. The division number must not be larger than the number of
divisions.
Linear axis: The indexing axis is positioned to the defined division number.
Divisions along shortest direction of rotation: (G68)
For rotary axes only!
The rotary axis is positioned as for G90 to the defined division number within 360 degrees,
however the division number is approached along the shortest path (time optimized
positioning).
Note:
The listed function behave in the same way as corresponding G functions. However, no G
functions are displayed and none are transmitted to the PLC.
Division counter
Several axis actual values in the indexing grid can be displayed for an indexing axis. The
division counter converts the actual values into indexing positions. An indexing position can be,
for example, an approached location number of a tool magazine or the number of a tooth
space on a gear to be machined.
12–106
3
mdegrees
Division offset= 90000 mdegrees
0°
ND
300°
60°
5 6
4 1 90°
3 2
240° 120°
180°
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06.93
6FC5197- AA50
SINUMERIK 840C (IA)