Siemens SINUMERIK 840Di Function Manual page 224

Detailed Description
2.6 Path acceleration for real-time events (channel-specific)
Effective
Effective
Ineffective
Programming
For information about programming system variables in the part program or synchronized
actions, see Chapter: Programming.
2.6.2 Activation
Key statement
The function does not need to be activated.
2.6.3 Programming
Syntax
$AC_PATHACC =
Functionality
Real-time-event path acceleration is set via the channel-specific system variables.
2-12
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 modifications
•
Modification of the velocity default for "safely reduced velocity" within the context
•
of the "Safely Integrated" function
Real-time-event path acceleration 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
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0
Acceleration (B2)