Siemens SINUMERIK 840D sl Function Manual page 134

Detailed description
3.14 Diagnostics (HMI Advanced only)
Log definition
The log definition can contain up to 6 specified variables. The values of these variables are
written to the log file in the specified cycle. A list of variables, which may be selected for logging
purposes, is displayed. The clock cycle can be selected in multiples of the interpolator clock
cycle. The file size can be selected in Kbytes. A log definition must be initialized before it can
be activated on the NC for the purpose of acquiring the necessary values.
Log file size
Values between 3 KB (minimum) and 50 KB (maximum) can be selected as the log file size.
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 NC. 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.
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Function Manual, 08/2018, 6FC5397-5BP40-6BA2
Synchronized actions