BECKHOFF CB1061 - Manual (Page 50)

Chapter: Connectors Jumper Settings
page 50 Beckhoff New Automation Technology CB1061
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 settings from normal (pins 1 & 2 short) to "Clear
CMOS" (pins 2 & 3 short) first on jumper Clear CMOS 1 and then on jumper Clear CMOS 2, wait a few
seconds, put the jumpers back into normal position and reboot.
C
AUTION
In order to avoid an undefined system state it is essential to ensure that the shorting of jumper Clear
CMOS 1 (J1800) takes place BEFORE and only combined with the shorting of jumper Clear CMOS 2
(J1801).
Furthermore please notice, that 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.