Siemens SINUMERIK 840Di Function Manual page 264

Examples
4.4 Knee-shaped acceleration characteristic curve
Machine data
• Parameterizing the characteristic curve (example only)
X axis
MD35220 $MA_ACCEL_REDUCTION_SPEED_POINT[X] = 0.4
MD35230 $MA_ACCEL_REDUCTION_FACTOR[X] = 0.85
MD35242 $MA_ACCEL_REDUCTION_TYPE[X] = 2
MD35240 $MA_ACCEL_TYPE_DRIVE[X] = TRUE
Y axis
MD35220 $MA_ACCEL_REDUCTION_SPEED_POINT[Y] = 0.0
MD35230 $MA_ACCEL_REDUCTION_FACTOR[Y] = 0.6
MD35242 $MA_ACCEL_REDUCTION_TYPE[Y] = 1
MD35240 $MA_ACCEL_TYPE_DRIVE[Y] = TRUE
Z axis
MD35220 $MA_ACCEL_REDUCTION_SPEED_POINT[Z] = 0.6
MD35230 $MA_ACCEL_REDUCTION_FACTOR[Z] = 0.4
MD35242 $MA_ACCEL_REDUCTION_TYPE[Z] = 0
MD35240 $MA_ACCEL_TYPE_DRIVE[Z] = FALSE
• Activation by setting as the channel-specific default setting
Part program (excerpt)
N10 G1 X100 Y50 Z50 F700
N15 Z20
N20 BRISK
N25 G1 X120 Y70
N30 Z100
N35 POS[X] = 200 FA[X] = 500
N40 BRISKA(Z)
N40 POS[Z] = 50 FA[Z] = 200
N45 DRIVEA(Z)
N50 POS[Z] = 100
N55 BRISKA(X)
...
4-6
MC_GCODE_RESET_VALUE[20] = 3 (DRIVE)
Path motion (X,Y, Z) with DRIVE
Path motion (Z) with DRIVE
Switchover to BRISK
Path motion (Y, Z) with substitute
characteristic curve
Path motion (Z) with BRISK
Positioning motion (X) with DRIVEA
Activate BRISKA for Z
Positioning motion (Z) with BRISKA
Activate DRIVEA for Z
Positioning motion (Z) with DRIVE
results in error message
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0
Acceleration (B2)