Siemens SINUMERIK 840D Function Manual page 225

Note
Modulo partition axes
By aligning the two following machine data, indexing positions of 360° modulo indexing axes
can be implemented in the same way as for the 360° modulo range:
● MD30503 $MA_INDEX_AX_OFFSET
● MD30340 $MA_MODULO_RANGE_START
See the examples in Chapter "Indexing axes, "Example 3: Rotary modulo axis as equidistant
indexing axis (Page 254)" and the following chapters.
360° 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>
Position display in the 360° modulo representation
Activating the position display at the user interface in the 360° modulo representation is realized
using the axis-specific machine data:
MD30320 $MA_DISPLAY_IS_MODULO = 1
NC/PLC interface signals
Activating the traversing range limits
In principle, the traversing range of a 360° modulo rotary axis is infinity. This is the reason that
axis-specific traversing range limits to not apply as standard, such as software limit switches
and working error limits. The traversing range limits of a 360° modulo rotary axis can be
activated using the subsequent absolute axis-specific NC/PLC interface signal, possibly
initiated via an M/H function in the NC program:
DB31, ... DBX12.4 = 1 (360° modulo rotary axes: Activate traversing range limits)
Axes and spindles
Function Manual, 06/2019, A5E47437747B AA
Meaning
0 The 360° modulo rotary axis positions corresponding to AC as standard for G90 program‐
ming:
● Target position > Current position: Move in positive traversing direction
● Target position < Current position: Move in negative traversing direction
1 For G90 programming, the 360° modulo rotary axis positions as standard corresponding
to DC, i.e. the shortest path.
R2: Rotary axes
7.2 Modulo 360 degrees
225