Programming - Siemens SINUMERIK 840D sl Function Manual

B2: Acceleration
5.2 Functions
Effectiveness
Effective
Not effective

Programming

For information about programming system variables in the part program or synchronized
actions, see Section "Programming (Page 254)".
5.2.6.2 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).
254
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
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
Basic Functions