Siemens SIMATIC CPU 1515SP PC2 F, Руководство пользователя

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Functions
10.5 "Unified Write Filter (UWF)" write filter
CPU 1515SP PC2 (F/T/TF)
Operating Instructions, 09/2018, A5E42603425-AA
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10.5 "Unified Write Filter (UWF)" write filter
General information on the UWF write filter
The Unified Write Filter (UWF) is a configurable write filter which provides the CFast cards
with a write protection.
External removable media such as USB sticks and other flash drives that are recognized as
removable media by the operating system are not supported.
NOTICE
Data loss on CFast cards
The number of write cycles on CFast cards is limited due to technical reasons.
To prevent data loss, the CFast card must therefore be provided with special protection.
Use the UWF write filter to extend the service life of the CFast card and to avoid a possible
failure of the CPU 1515SP PC2.
Note
Write protection is deactivated in the delivery state!
Note that the work memory is reduced when UWF is activated.
NOTICE
Risk of data loss when UWF is activated
If UWF is activated, all changes made to data carriers which are write protected by the
UWF after the boot operation may be lost when the device is shut down.
Proceed as follows to prevent this situation:
• Make changes to data carriers only when write protection is disabled.
Reference
You can find additional information on the UWF write filter on the Internet in the online help
for Microsoft® Windows® 10.