Siemens simatic ipc227e Operating Instructions Manual page 52

Commissioning the device and device functions
4.4 Advanced device functions
Note
The EWF commands affecting the write protection do not become active until after the next
booting process.
Note
The EWF command
not like this:
Special features for the use of Enhanced Write Filters (EWF)
● In the event of a power failure, if the EWF is enabled changes made after the boot
sequence on drive C: are lost.
To prevent data loss in the event of a power failure, the use of a UPS is recommended.
● You can save the data in the EWF RAM overlay to the memory card or the hard disk
before you shut down the device. To do so, enter the following command in the command
prompt:
ewfmgr c: -commit
Note
When the system is set to automatically adjust the clock for daylight saving time adjustment,
systems without central time management and with activated EWF set the clock forward or
backward by one hour in the daylight saving time or standard time period each time the
system boots.
The reason for this behavior is that Windows Embedded Standard has a registry entry that
detects whether the clock has been adjusted for daylight saving time. Since this file is also
protected against modification by the EWF, the marker is lost during the boot sequence and
the adjustment is made again.
We therefore recommend that you deactivate the automatic adjustment and change the
clock manually.
Follow these steps:
1. Deactivate automatic adjustment in the Control Panel. In the "Time Zone" tab opened
with the menu command Start > Control Panel > Date and Time, remove the check mark
from the "Automatically adjust clock for daylight saving changes" check box.
2. Save the change you have made with
52
ewfmgr c: -commitanddisable
ewfmgr c: -commitanddisable –live
cannot be used with the
).
and then reboot the system.
ewfmgr c: -commit
Operating Instructions, 11/2016, A5E35782395-AB
options (i.e.
–Live
SIMATIC IPC227E