Siemens SINUMERIK 840D sl Function Manual page 246

Functions
2.11 Jerk limitation with path interpolation (SOFT) (channel-specific)
2.11 Jerk limitation with path interpolation (SOFT) (channel-specific)
2.11.1 Detailed Description
2.11.1.1 General Information
Overview
As far as the functionality described in the rest of this document is concerned, constant
acceleration, i.e., acceleration with jerk limitation (jerk = infinite value), is the assumed
acceleration profile. In the case of acceleration with jerk limitation, linear interpolation is
applied in respect of acceleration from 0 to the maximum value.
Advantages
Minimal load on the machine's mechanical components and low risk of high-frequency and
difficult-to-control mechanical vibrations thanks to constant excessive acceleration.
Disadvantages
Longer machining times compared with stepped acceleration profile when the same
maximum velocity and acceleration values are used.
28
Basic logic functions: Acceleration (B2)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0