Function: Substitute Curve - Siemens SINUMERIK 840D Function Manual

B2: Acceleration and jerk
12.2 Functions
3. Acceleration reduction: 2 = linear characteristic
4. No acceleration reduction effective
A situation where no acceleration reduction is active arises for example when:
MD35220 $MA_ACCEL_REDUCTION_SPEED_POINT = 1
and / or
MD35230 $MA_ACCEL_REDUCTION_FACTOR = 0
Note
Machine axes featuring stepper motor and DC drive can be interpolated together.
12.2.19.3

Function: Substitute curve

If the programmed path cannot be traversed with the acceleration curve parameterized in the
machine data of the participating axes, e.g. if kinematic transformation and acceleration
types BRISK or SOFT are active, a substitute curve is generated by reducing the dynamic limit
values. The reduced dynamic limit values are calculated to ensure that the substitute
characteristic curve provides the best possible compromise between maximum velocity and
constant acceleration.
380
Axes and spindles
Function Manual, 06/2019, A5E47437747B AA