Siemens SINUMERIK 840D sl Function Manual page 229

2.1.1.2 Programmable maximum value (axis-specific)
Function
The maximum acceleration value can be set for each specific machine axis:
MD32300 $MA_MAX_AX_ACCEL (maximum axis acceleration)
The path parameters are calculated by the path planning component during preprocessing
so that the programmed maximum values of the machine axes that are of relevance for the
path are not exceeded.
Exceeding of maximum value
It is possible for the maximum value to be exceeded in connection with specific machining
situations (see Section: Acceleration matching (ACC) and System variable
($AC_PATHACC)).
2.1.2 Activation
2.1.2.1 Parameterization
Programming
The maximum values are parameterized for specific axes using machine data:
MD32300 $MA_MAX_AX_ACCEL (maximum axis acceleration)
2.1.3 Programming
2.1.3.1 Path acceleration without jerk limitation (BRISK)
Syntax
BRISK
Functionality
The BRISK part-program instruction is used to select the "without jerk limitation" acceleration
profile for the purpose of path acceleration.
G group: 21
Effective: Modal
Basic logic functions: Acceleration (B2)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0
2.1 Acceleration without jerk limitation (BRISK/BRISKA) (channel-/axis-specific)
Functions
11