Siemens SINUMERIK 828D Function Manual page 139

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 cycle can be selected in multiples of the interpolation
cycle. The file size can be selected in Kbytes. A log definition must be initialized before it can
be activated on the NCK 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 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
Synchronized actions
Function Manual, 07/2012, 6FC5397-5BP40-3BA0
Detailed description
2.14 Diagnostics (HMI Advanced only)
139