Boundary Conditions - Siemens SINUMERIK 840D Function Manual

Meaning
DRIVEA:
<axis_x>:
Supplementary conditions
If the knee-shaped acceleration characteristic curve is parameterized for an axis, then this
becomes the default acceleration profile for 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.
12.2.19.7

Boundary conditions

Single axis interpolation
After activating the knee-shaped acceleration characteristic curve in case of single-axis
interpolations (positioning axis, oscillating axis, manual traversing, 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 curve parameterized without the part program instruction DRIVE is active, then
a substitute characteristic curve with reduced dynamic limit values is determined for the path.
Kinematic transformation
The knee-shaped acceleration characteristic curve 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.
Axes and spindles
Function Manual, 06/2019, A5E47437747B AA
Axis-specific activation of the parameterized knee-shaped acceleration char‐
acteristic curve.
Effectiveness: Modal
Axis for which the parameterized knee-shaped acceleration characteristic
curve is to be activated.
Data type: AXIS
Value range: Channel axis names
B2: Acceleration and jerk
12.2 Functions
387