1-second UPS (persistent variables)
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Version: 2.8
SUPS Enable
Options: Enable / Disable
Switches the 1-second UPS on or off.
Hold USB
Options: Enable / Disable
Switches off the power supply for the USB ports in UPS mode.
Delay
Options: 0…255 seconds
Start delay with which the 1-second UPS is charged.
SUPS Firmware version
Firmware version
Current Power source
Status of the power supply: On Line / Battery
Battery load level
Charge state in percent (n% cap. (n={0...100}) describes the capacity of the 1-second UPS)
Powerfail counter
Number of voltage failures
8.2
Windows write filter
Since the persistent data are stored on a storage medium, the file and the path must be writeable. If you use
the Windows write filter, the Windows partition is protected against write access operations, and the
persistent data are not saved.
• Switch off the EWF, if you want to save persistent data.
• The FBWF and UWF do not have to be switched off, because an exception can be defined for the
directory \Boot.
For Windows CE and Windows Embedded Compact 7 no Windows write filters are used.
FBWF exception list
By default an exception list is automatically created when the FBWF is switched on. The \Boot directory is
already entered in this list. Check the configuration of the FBWF if you have made changes to the exception
list.
Fig. 32: FBWF exception list, under TwinCAT 2 (left) and TwinCAT 3.
The persistent data are saved by default under \TwinCAT\Boot in TwinCAT 2 and under \TwinCAT\3.1\Boot
in TwinCAT 3.
The FBWF can be configured via the Beckhoff FBWF manager.
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