Acceleration With Active Jerk Limitation (Soft/Softa) (Axis-Specific); General Information; Parameterization; Excessive Acceleration For Non-Tangential Block Transitions (Axis-Specific) - Siemens SINUMERIK 828D Function Manual

4.2.9

Acceleration with active jerk limitation (SOFT/SOFTA) (axis-specific)

4.2.9.1

General Information

Function
Compared with acceleration without jerk limitation, acceleration with jerk limitation results in a certain degree of
time loss, even when the same maximum acceleration value is used. To compensate for this time loss, a specific
maximum value can be programmed for the axis-specific acceleration as far as traversing of the machine axes
with active jerk limitation (SOFT/SOFTA) is concerned.
The maximum value for acceleration with active jerk limitation is parameterized using a factor calculated in
relation to the axis-specific maximum value. This is used to generate the maximum value for axis-specific
acceleration with active jerk limitation that is taken into account by the path planning component during
preprocessing:
Acceleration[axis] =
MD32300 $MA_MAX_AX_ACCEL * MD32433 $MA_SOFT_ACCEL_FACTOR
4.2.9.2

Parameterization

The maximum value for acceleration with active jerk limitation (SOFT/SOFTA) is parameterized using the axis-
specific machine data:
MD32434 $MA_SOFT_ACCEL_FACTOR
(scaling of the acceleration limitation with SOFT)
4.2.10

Excessive acceleration for non-tangential block transitions (axis-specific)

4.2.10.1 General Information
Function
In the case of non-tangential block transitions (corners), the programmable controller may have to decelerate the
geometry axes significantly in order to ensure compliance with the parameterized axis dynamics. For the purpose
of reducing/avoiding deceleration in connection with non-tangential block transitions, a higher level of axis-
specific acceleration can be enabled.
Excessive acceleration is parameterized using a factor calculated in relation to the axis-specific maximum value.
This is used to generate the maximum value for axis-specific acceleration with non-tangential block transitions
that is taken into account by the path planning component during preprocessing:
Acceleration[axis] =
MD32300 $MA_MAX_AX_ACCEL * MD32310 $MA_MAX_ACCEL_OVL_FACTOR
Basic Functions
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
B2: Acceleration
4.2 Functions
229