Unified Write Filter (Uwf)" Write Filter - Siemens SIMATIC ET 200SP Operating Instructions Manual

Functions
10.6 "Unified Write Filter (UWF)" write filter
5. To specify switching to sleep mode after a specific period of time, select "Put the computer
to sleep:" Your desired time.
6. Save your new settings with "Apply changes".
Note
The Software Controller does not work when power save mode is enabled.
10.6

"Unified Write Filter (UWF)" write filter

General information on the write filter
The "Unified Write Filter" is a feature that helps you protect your drives.
The standard abbreviation for the Unified Write Filter is "UWF". Enabling the filter ensures
that data is no longer saved retentively on the system. All write access operations are
swapped out to the work memory (RAM) and are available until system restart. As soon as
the computer is restarted, it loses its memory and goes back to the state that it was in before
the filter was enabled.
NOTICE
Risk of data loss with enabled "UWF"
When the device is shut down, all changes made after the boot process may be lost due to the
write-protected data storage medium.
To prevent this from happening, make changes to data storage media only with disabled write
protection.
The "UWF" is disabled in the delivery state.
The filter does not support external removable data storage media, such as USB sticks and
other flash drives, that are recognized as removable data storage media by the operating
system.
Enable write protection
To enable the "Unified Write Filter = UWF" under Windows, follow these steps:
Control Panel > Programs > Programs and Features > Turn Windows features on or off >
Device Lockdown > Uniform Write Filter
Note
Note that the work memory is reduced when "UWF" is enabled.
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CPU 1515SP PC2 (F/T/TF)
Operating Instructions, 03/2023, A5E42603425-AC