Programming - Siemens SINUMERIK 840D sl Function Manual

B2: Acceleration
5.2 Functions
Effectiveness
Effective
Not effective

Programming

For the purpose of setting the jerk for real-time events in accordance with the acceleration, the
system variables can be set as follows:
$AC_PATHJERK = $AC_PATHACC/smoothing time
● $AC_PATHACC: Path acceleration [m/s
Smoothing time: Freely selectable, e.g. 0.02 s
For information about programming system variables in the part program or synchronized
actions, see Section "Programming (Page 266)".
5.2.14.2 Programming
Syntax
$AC_PATHJERK =
Functionality
The path jerk for real-time events is set via the channel-specific system variables.
Jerk value :
● Value range: Path jerk ≥ 0
● Unit: m/s
Application:
● Part program
● Static synchronized action
Reset behavior
The function is deactivated on reset.
266
Path jerk for real-time events 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 jerk for real-time events is ineffective for changes in the path velocity that are
attributable to path planning during preprocessing for the channel, such as contour
curvatures, corners, kinematic transformation limitations, etc.
Path jerk for real-time events is ineffective if the programmed value is smaller than
the path jerk calculated during preprocessing for the path section concerned.
path jerk
3
]
2
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
Basic Functions