Siemens SINUMERIK 840D sl Function Manual page 274

Examples
4.2 Jerk
Figure 4-2 Switching between path jerk specified during preprocessing and $AC_PATHJERK
Acceleration profile: SOFT
1: Jerk according to $MA_MAX_AX_JERK[..]
2: Jerk according to $AC_PATHJERK
3: Jerk according to $MA_MAX_AX_JERK[..] (approach block end velocity)
4: Velocity limit due to arc
5: Jerk according to $AC_PATHJERK
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Basic logic functions: Acceleration (B2)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0