Programming - Siemens SINUMERIK 840D Function Manual

B2: Acceleration and jerk
12.2 Functions
Effectiveness
Effective
Not effective

Programming

For information about programming system variables in the part program or synchronized
actions, see Section "Programming (Page 358)".
12.2.6.2 Programming
Syntax
$AC_PATHACC =
Functionality
Real-time-event path acceleration is set via the channel-specific system variables.
Parameter:
● Value range: Path acceleration ≥ 0
● Unit: m/s
Deactivation: $AC_PATHACC = 0
Application:
● Part program
● Static synchronized action
Reset response
Real-time-event path acceleration is deactivated on reset.
Supplementary conditions
Programming $AC_PATHACC in the part program automatically triggers a preprocessing stop
with REORG (STOPRE).
358
Real-time event acceleration is only enabled in AUTOMATIC and MDA operating modes
in conjunction with the following real-time events:
● NC Stop / NC Start
● Override changes
● Changing the velocity default for "safely reduced velocity" within the context of the
"Safety Integrated" function
Path acceleration for real-time events is ineffective for changes in path velocity that are
attributable to path planning during preprocessing for the channel, such as contour
curvatures, corners, kinematic transformation limitations, etc.
Real-time-event path acceleration is ineffective if the programmed value is smaller than
the path acceleration calculated during preprocessing for the path section concerned.
path acceleration
Path acceleration
2
Axes and spindles
Function Manual, 06/2019, A5E47437747B AA