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2.2.7
Battery backup
Battery connection
In order to backup configured values to memory on power failure (using the SAV function
blocks), you need to install two commonly available size AA leak-proof alkaline manganese
batteries with a rated voltage of 1.5 V in the power supply circuit.
It is recommended to replace the batteries at annual intervals.
The backup function is no longer available if you remove the power supply unit (e.g. in the
case of malfunction, or fan replacement).
Battery voltage monitoring
The CPU module inserted in slot 1 detects missing or low backup batteries and signals these
states with a flashing "b".
Battery replacement
You should always replace the battery while the rack is powered on in order to prevent data
loss.
Note that while installing the battery you also need to take corresponding measures in
preparation for its replacement.
SIMATIC TDC hardware
System Manual, 12/2013, A5E01114865-07
2.2 Rack UR5213 (6DD1682-0CH0)
Rack
55
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