BECKHOFF CB1052 - Manual (Page 46)

Chapter: Connectors Jumper Settings
page 46 Beckhoff New Automation Technology CB1052
3.5 Jumper Settings
3.5.1 Clear CMOS
In case the board doesn't start up anymore and BIOS setup is inaccessible there is a "last resort": You
can use the "Clear CMOS" jumpers to reset all CMOS settings to factory defaults. In order to do so you
need to shut down the computer, change the jumper setting from normal (pins 1 & 2 short) to "Clear
CMOS" (pins 2 & 3 short) for both jumpers, wait a few seconds, put the jumpers back into normal position
and reboot.
C
AUTION
If you reset the CMOS this does not only bring all settings made in BIOS setup back to default values, it
also clears the date and time information stored in CMOS. So don't forget that, after the Clear CMOS
procedure, you will have to set the clock again.