Siemens SINUMERIK 840D Function Manual page 641

Maximum axis-specific acceleration for JOG motion
The maximum acceleration for manual traversing of an axis is defined in machine data:
MD32300 $MA_MAX_AX_ACCEL [0] (maximum axis-specific acceleration for path motions in
the dynamic response mode DYNNORM)
Note
Only the dynamic response mode DYNNORM is always effective for JOG mode.
Basic setting of axis-specific jerk limitation
Acceleration with jerk limitation can be specified as the axis-specific basic setting for JOG
mode:
MD32420 $MA_JOG_AND_POS_JERK_ENABLE== TRUE
Maximum axis-specific jerk
For JOG motions with active jerk limitation, the value from the following machine data takes
effect as maximum axis-specific jerk:
MD32430 $MA_JOG_AND_POS_MAX_JERK (maximum axis-specific jerk)
Note
MD32430 $MA_JOG_AND_POS_MAX_JERK acts only when the axis-specific jerk limitation in
JOG mode has been enabled for the machine axes to be traversed:
MD32420 $MA_JOG_AND_POS_JERK_ENABLE [<axis>] == TRUE
This is also possible by programming SOFTA(<Axis1>,<Axis2>, ...) in the part program.
Maximum acceleration when manually traversing spindles
As a spindle often uses many gear stages in speed-control mode and position-control mode,
the acceleration associated with the current gear stage is always applied to the spindle in JOG
mode.
Further information
S1: Spindles (Page 733)
Maximum acceleration when manually traversing geometry axes
The maximum acceleration when manually traversing geometry axes can be specified for each
channel via the machine data:
MD21166 $MC_JOG_ACCEL_GEO [<geometry axis>]
With <geometry axis> = 0, 1, 2
Note
With MD21166 $MC_JOG_ACCEL_GEO [<geometry axis>], there is no direct limitation to
MD32300 $MA_MAX_AX_ACCEL.
Axes and spindles
Function Manual, 06/2019, A5E47437747B AA
H1: Manual traversing
17.3 Parameter assignment (general)
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