Siemens SIMATIC ET 200SP User Manual page 80

Functions
8.5 Protective functions for data carriers
Special features when using the EWF
NOTICE
Data loss upon power failure and upon shutdown/restart
If the EWF is active, all changes made on the C drive are lost after power failure and on
shutdown/restart.
Use an UPS to prevent data losses after power failure.
Back up the data in the EWF-RAM overlay to the CFast card before shutting down the
CPU 1515SP PC (F). In the command line, enter the following commands:
ewfmgr c: -commit
Restart the device
Or
ewfmgr c: -commitanddisable
Restart the device
ewfmgr c: -enable
Restart the device
Note
Data loss
If EWF is active and you decline a restart after having set the -
option, your data is lost after a power failure!
80
or -
commitanddisable commit
CPU 1515SP PC (F)
Manual, 05/2017, A5E32701806-AC