Siemens SINUMERIK 840D sl Function Manual page 238

Functions
2.6 Path acceleration for real-time events (channel-specific)
2.6 Path acceleration for real-time events (channel-specific)
2.6.1 Detailed Description
2.6.1.1 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
• Feedrate override modifications
• Modification of the velocity default for "safely reduced velocity" within the context of the
the path acceleration can be set for the real-time events specified above 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 control so
that the resulting axial acceleration (a
maximum axial value (a
a
res
Note
Real-time-event path acceleration is enabled, irrespective of the radial acceleration.
20
"Safely Integrated" function
path acceleration
max
= 2 * a mit a = MD32300 $MA_MAX_AX_ACCEL
max, max
) is restricted to less than 2x the parameterized
res
).
Basic logic functions: Acceleration (B2)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0