Extended device functions
5.4 SRAM buffer memory (optional)
SIMATIC IPC627D/827D
Operating Instructions, 09/2014, A5E32990859-AB
55
Configuring FBWF
FBWF can be configured in command console using the program FBWFMGR.EXE.
Note
•
Observe the following syntax: Enter a space after the drive designation colon.
•
Changes for direct write access only take effect after rebooting.
•
Only existing files and folders can be entered in the exception list.
Function
Command
Display the current FBWF status
fbwfmgr /displayconfig
Enable FBWF after the next startup
fbwfmgr /enable
Write to protected files
fbwfmgr /commit c: \Test.txt
Adding/removing elements in the exception list:
•
Add file
fbwfmgr /addexclusion C: \Test.txt
•
Add folder
fbwfmgr /addexclusion C: \Test fold-
er
•
Remove file
fbwfmgr /removeexclusion
C: \Test.txt
•
Remove folder
fbwfmgr /removeexclusion C: \Test
folder
Call up the help function
fbwfmgr /?
Detailed instructions on FBWF are available on the Internet (
us/library/aa940926(WinEmbedded.5).aspx
5.4
SRAM buffer memory (optional)
In order for applications to store data following a power failure, motherboards with fieldbus
(PROFIBUS or PROFINET) feature battery-buffered SRAM. If the supply voltage fails for
more than 20 ms for the AC power supply or more than 5 ms for the DC power supply, then
you will be informed about this situation by the NAU signal.
At least 10 ms is available to copy the data to the buffered RAM. During this time, 128 Kb
can be saved with a full load and even more with a smaller configuration, in other words, a
lesser load. A maximum 2 MB memory window is displayed via a PCI address register. The
base address is initialized by the BIOS.
A corresponding function is implemented there for using the SRAM under WinAC RTX.
Note
If replacement of the battery takes longer than 30 seconds, the data saved in the CMOS
RAM and in the buffered SRAM is lost.
Note
The buffer memory SRAM is available only with devices with PROFIBUS or PROFINET
interfaces.
See also
Status displays (Page 15)
