Siemens SINUMERIK 840Di Function Manual page 239

Effective
Effective
Ineffective
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
For information about programming system variables in the part program or synchronized
actions, see Chapter: Programming.
2.14.2 Activation
Key statement
The function does not need to be activated.
2.14.3 Programming
Syntax
$AC_PATHJERK =
Acceleration (B2)
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0
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 modifications
•
Modification of the velocity default for "safely reduced velocity" within the context
•
of the "Safely 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.
Smoothing time: Freely selectable, e.g., 0.02 s
path jerk
2.14 Path jerk for real-time events (channel-specific)
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2
Detailed Description
2-27