Acceleration With Active Jerk Limitation (Soft/Softa) (Axis-Specific); General Information; Parameterization; Excessive Acceleration For Non-Tangential Block Transitions (Axis-Specific) - Siemens SINUMERIK 840D sl Function Manual

B2: Acceleration
5.2 Functions
5.2.8

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

5.2.8.1

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
5.2.8.2

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)
5.2.9

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

5.2.9.1

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
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Function Manual, 01/2015, 6FC5397-0BP40-5BA2
Basic Functions