Siemens SINUMERIK 840D sl Function Manual page 735

Example values:
● Starting position = 180: Modulo range -180° to +180°
● Starting position = 0: Modulo range 0° - 360°
Figure 13-3
Note
Modulo partition axes
By approximating the two following machine data, indexing positions of modulo indexing axes
can be implemented in the same way as for the modulo range (see also Section "T1: Indexing
axes (Page 815)").
● MD30503 $MA_INDEX_AX_OFFSET
● MD30340 $MA_MODULO_RANGE_START
Modulo rotary axis: Positioning behavior for G90 (modal absolute programming)
The standard behavior for G90 is set via the machine data:
MD30455 $MA_MISC_FUNCTION_MASK, bit 2 = <value>
<value>
Extended Functions
Function Manual, 10/2015, 6FC5397-1BP40-5BA3
Starting position of -180° changes the modulo range to -180° to + 180°
Meaning
0 The modulo rotary axis positions corresponding to AC as standard for G90 programming:
● Target position > Current position: Move in positive traversing direction
● Target position < Current position: Move in negative traversing direction
1 The modulo rotary axis positions corresponding to DC as standard for G90 programming,
i.e. on the shortest path.
R2: Rotary axes
13.2 Modulo 360 degrees
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