Siemens simatic ET 200SP User Manual page 70

Functions
8.5 Protective functions for data carriers
Note
Disabling automatic daylight saving changes
In systems without central time management and with activated EWF, the time is advanced
or set back by one hour in the daylight saving time or standard time period each time the
system performs a cold or warm restart, due to the system-specific function for automatic
daylight saving changes.
Reason for this behavior: Windows Embedded Standard 7 sets a flag in a registry entry that
indicates completion of the conversion to 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.
Proceed as follows:
1. Disable the EWF filter (
2. Deactivate automatic adjustment in the Control Panel:
Remove the check mark under Start > Control Panel > Date and Time > "Time Zone" tab
at "Automatically adjust clock for daylight saving changes".
3. Save the change (
4. Switch on the EWF again (
70
ewfmgr c: -commitanddisable
).
ewfmgr c: -commit
ewfmgr c: -commitanddisable
) and reboot the system.
) and reboot the system.
Manual, 12/2014, A5E32701806-AA
CPU 1515SP PC