Siemens SINUMERIK 840D sl Function Manual page 856

R2: Rotary axes
13.2 Modulo 360 degrees
Figure 13-4
Application
By adjusting the following two machine data
MD30503 $MA_INDEX_AX_OFFSET
MD30340 $MA_MODULO_RANGE_START,
indexing positions of modulo indexing axes can be implemented in the same way as for the
modulo range.
References:
/FB2/ Function Manual Extended Functions; Indexing Axes (T1)
856
Starting position of -180° changes the modulo range to -180° to + 180°
Function Manual, 09/2009, 6FC5397-1BP20-0BA0
Extended Functions