Siemens SINUMERIK 840Di sl Function Manual page 123

Storage method
When the effective log file size has been exceeded, the oldest entries are overwritten, i.e.
the file works on the circular buffer principle.
Starting logging
Logging according to one of the initialized log definitions is started by:
• Operation
• Setting system variable $A_PROTO=1 from the part program
The starting instant must be selected such that the variables to be logged are not altered
until operations on the machine have been activated. The start point refers to the last log
definition to be initialized.
Stopping logging
This function terminates the acquisition of log data in the NCK. The file containing the logged
values is made available on the HMI for storage and evaluation (graphic log). Logging can
be stopped by:
• Operation
• Setting system variable $A_PROTO=0 from the part program
Graphic log function
The measured values (up to 6) of a log are represented graphically as a function of the
sampling time. The names of variables are specified in descending sequence according to
the characteristics of their values. The screen display is arranged automatically. Selected
areas of the graphic can be zoomed.
Note
Graphic log representations are also available as text files on the HMI Advanced. An editor
can be used to read the exact values of a sampling instant (values with identical count index)
numerically.
Managing logs
Several log definitions can be stored under user-defined names. They can be called later for
initialization and start of recording or for modification and deletion.
Synchronized actions
Function Manual, 11/2006, 6FC5397-5BP10-2BA0
2.9 Diagnostics (only with HMI Advanced)
Detailed description
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