Siemens SINUMERIK 840D sl Function Manual page 253

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Path jerk for real-time events (channel-specific)

Detailed Description

General Information

So that no compromise has to be made between machining-optimized jerk on the one hand

and time-optimized jerk in connection with the following real-time events on the other:

• NC-STOP/NC-START

• Feedrate override modifications

• Modification of the velocity default for "safely reduced velocity" within the context of the

the path jerk can be set for the real-time events specified above using a channel-specific

system variable:

$AC_PATHJERK =

Path jerk for real-time events will only be active for the duration of the change in velocity in

respect of one of the real-time events specified above.

As the jerk is not a physical variable of any relevance to the drive, no limit is imposed on the

Basic logic functions: Acceleration (B2)

Function Manual, 11/2006, 6FC5397-0BP10-2BA0

"Safely Integrated" function

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.

2.14 Path jerk for real-time events (channel-specific)

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