Path Acceleration For Real-Time Events (Channel-Specific); General Information - Siemens SINUMERIK 840D Function Manual

Parameter:
● Value range: TRUE, FALSE
Application:
● Part program
● Static synchronized action
12.2.6

Path acceleration for real-time events (channel-specific)

12.2.6.1

General Information

General Information
So that no compromise has to be made between machining-optimized acceleration on the one
hand and time-optimized acceleration in connection with the following real-time events on the
other:
● NC Stop / NC Start
● Changing the feedrate override
● Changing the velocity default for "safely reduced velocity" within the context of the "Safety
Integrated" function
For the real-time events mentioned above, the path acceleration can be specified using a
channel-specific system variable:
$AC_PATHACC =
Real-time event acceleration will only be active for the duration of the change in velocity in
respect of one of the real-time events specified above.
Limitation
If the specified path acceleration exceeds the capabilities of the machine axes that are of
relevance for the path, a limit will be imposed on the path acceleration within the controller so
that the resulting axial acceleration (a
maximum axial value (a
a
res
Note
Path acceleration for real-time events is enabled, irrespective of the radial acceleration.
Axes and spindles
Function Manual, 06/2019, A5E47437747B AA
Value
path acceleration
).
max
= 2 * a with a = MD32300 $MA_MAX_AX_ACCEL
max, max
) is restricted to less than 2x the parameterized
res
B2: Acceleration and jerk
12.2 Functions
357