Extended device functions
5.2 Enhanced Write Filter (EWF)
SIMATIC IPC627D/827D
Operating Instructions, 09/2014, A5E32990859-AB
51
The "Reset on" option immediately triggers a hardware reset that may result in loss of data
under Windows and damage to the installation.
Watchdog monitoring times
The monitoring time can be configured with the DiagBase or DiagMonitor software.
Note
When you change the monitoring time, the change becomes effective
immediately.
The installed buffer battery has a service life of at least 5 years. The status can be checked
with two-tier battery monitoring. The information can be read from an I/O register and
evaluated.
When the first warning level is reached, the remaining service life of the battery for buffering
CMOS data and buffer memory is at least 1 month.
Enhanced Write Filter (EWF)
Purpose and function
The Enhanced Write Filter (EWF) is a function that is only available for Windows Embedded
operating systems. EWF is a write filter that can be configured by the user.
You can use the Enhanced Write Filter to boot Windows Embedded Standard from read-only
media, for example, memory cards or Solid State Drives (SSD), or provide individual
partitions with write protection.
EWF can be used to minimize write access to storage media. This is important because the
write cycles are limited due to technical reasons. We therefore recommend using EWF if you
work with these storage media.
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