Jumper Settings; Clear Cmos - Beckhoff CB1064 Series Manual

Jumper Settings

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.
Notice
Beckhoff New Automation Technology CB1064-xxxx
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.
Chapter: Connectors
page 49