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Motherboard
2.4
Changing the Backup Battery
Battery Power
A backup battery powers the real-time clock even after the PC is switched
Supply for
off. In addition to the time of day, all information about the SIMATIC PC
Real-Time Clock
(configuration) is stored. If the backup battery fails or is removed, these data
and Configuration
are lost.
Because of the clock's low power consumption and the lithium battery's high
capacity, the battery can provide backup power for the real-time clock for
several years. Therefore, changing the battery is only seldom required.
Battery Voltage
If the battery voltage is too low, the current time setting is lost and a correct
Too Low
configuration can no longer be guaranteed.
Changing the
In this case, you must replace the battery. The battery is located underneath
Battery
the bus board.
To change the battery, please proceed as follows:
1. Switch off your PC and unplug all connecting cables.
2. Open the unit as described in Section 1.3.
3. Remove the drive support and bus module.
4. Now replace the backup battery, which is attached to the mother board by
5. Reassemble the drive support and bus module and close the unit.
Caution
!
You may only replace the lithium battery with an identical battery or a
battery type recommended by the manufacturer.
Dispose of used batteries in keeping with local regulations (special waste). If
returned to the manufacturer, the battery materials can be recycled.
Resetting SETUP
After having changed the backup battery, you have to reset the configuration
data of your PC using the SETUP program.
2-6
a short length of cable.
RI 45 PIII, Manual
C79000-G7076-C817-01
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