Siemens SINUMERIK 840Di Function Manual page 253

2.18.2.2 Activation
Key statement
The knee-shaped acceleration characteristic curve is activated for a specific machine axis
using the machine data:
MD35240 $MA_ACCEL_TYPE_DRIVE = TRUE
Single-axis interpolation
As soon as the knee-shaped acceleration characteristic curve is activated, in the case of
single-axis interpolations (positioning axis, reciprocating axis, manual travel, etc.), traversing
is performed exclusively in DRIVEA mode.
Switching of the acceleration profile via the part-program instructions:
• Abrupt acceleration changes (BRISKA)
• Acceleration with jerk limitation (SOFTA)
is not possible.
Path interpolation
If the knee-shaped acceleration characteristic curve is parameterized for a machine axis that
is of relevance for a programmed path, but the DRIVE part-program instruction has not been
activated, then a substitute characteristic curve with lower dynamic limit values is generated
for the path.
2.18.3 Programming
2.18.3.1 Channel-specific activation (DRIVE)
Syntax
DRIVE
Functionality
The knee-shaped characteristic curve is activated for path acceleration using the DRIVE
part-program instruction.
G group: 21
Effective: Modal
Acceleration (B2)
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0
2.18 Knee-shaped acceleration characteristic curve
Detailed Description
2-41