Boundary Conditions - Siemens SINUMERIK 840D sl Function Manual

Axis :
● Value range: Axis name of the channel axes
Reset behavior
The channel-specific default setting is activated via a reset:
MD20150 $MC_GCODE_RESET_VALUES[20]
Dependencies
If the knee-shaped acceleration characteristic curve is parameterized for a machine axis, then
this becomes the default acceleration profile for all traversing operations.
If the effective acceleration profile is changed for a specific axis using the SOFTA or BRISKA
part-program commands, then an appropriate substitute characteristic curve is used in place
of the knee-shaped acceleration characteristic curve.
It is possible to switch back to the knee-shaped acceleration characteristic curve for a specific
axis by programming DRIVEA.
5.2.19.6

Boundary conditions

Single axis interpolation
After activating the knee-shaped acceleration characteristics in case of single-axis
interpolations (positioning axis, oscillating axis, manual motion, etc.), the machine axis is
traversed exclusively in the mode DRIVEA .
It is not possible to switch over the acceleration profile via the following part program
instructions:
● Abrupt acceleration changes (BRISKA)
● Acceleration with jerk limitation (SOFTA)
Path interpolation
If for a machine axis involved in a programmed path the knee-shaped acceleration
characteristic parameterized without the part program instruction DRIVE is active, then a
substitute characteristic curve with reduced dynamic limiting values is determined for the path.
Kinematic transformation
The knee-shaped acceleration characteristic is not considered in an active kinematic
transformation. With internal control, a switchover is done to acceleration without jerk limitation
(BRISK) and a substitute characteristic curve becomes active for the path acceleration.
Basic Functions
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
B2: Acceleration
5.2 Functions
281