Siemens SIMATIC ET 200SP - Page 81

Functions
8.5 Protective functions for data carriers
CPU 1515SP PC (F)
Manual, 05/2017, A5E32701806-AC
81
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 w
arm 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 fi
le 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 (ewfmgr c: -commitanddisable) and reboot the system.
2.
Deactivate the automatic switchover in the Control Panel:
Start > Control Panel > Date and Time > in the tab "Time Zone" clear the check mark for
"Automatically adjust clock for daylight saving changes".
3.
Save the change (ewfmgr c: -commit).
4.
Switch on the EWF again (
ewfmgr c: -commitanddisable
) and reboot the system.