Siemens SINUMERIK 840D sl Commissioning Manual page 212

Managing user data
12.3 Preassignments when saving PLC data
3. Set the PLC to the RUN operating status.
Operating sequences for inconsistent image
An inconsistent image results if a series-commissioning file with PLC data is created and the
PLC is in the RUN state (cyclic operation). The data blocks of the PLC are saved at different
times with contents that under certain circumstances may meanwhile have changed. This
may result in a data inconsistency that, once the data backup has been copied back to the
PLC, may under certain circumstances result in a PLC stop in the user program.
NOTICE
The creation of a series-commissioning file with PLC data while the PLC is in RUN status
(cyclic operation) may result in an inconsistent PLC image in the series commissioning
archive. After this series-commissioning file has been copied back, this data inconsistency
in the PLC user program may under certain circumstances result in a PLC stop.
Changing the PLC operating status
The PLC operating status can be changed using:
● SIMATIC STEP7 Manager
● PLC mode selector on the NCU (position "2" -> STOP, position "0" -> RUN)
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Commissioning Manual, 07/2007, 6FC5397-2AP10-3BA0
IBN CNC: NCK, PLC, drive