Siemens SINUMERIK 840D Function Manual page 407

Figure 13-8 Software cams for modulo rotary axis (plus cam - minus cam > 180 degrees)
Suppression of signal inversion
With the following setting, selection of signal inversion for
"plus cam - minus cam > 180 degrees" can be suppressed.
MD10485 SW_CAM_MODE bit 1=1
Axes and spindles
Function Manual, 06/2019, A5E47437747B AA
N3: Software cams, position switching signals
13.2 Cam signals and cam positions
407