Maintenance
S7-300 Programmable Controller Hardware and Installation
A5E00105492-01
9-9
Note
Data in internal main memory will be lost if you replace the backup battery in
POWER OFF state of the CPU.
Always replace the backup battery in POWER ON state!
Replace the backup/rechargeable battery as follows:
Step CPU 313/314 CPU 314 IFM/315/315-2 DP/
316-2 DP/318-2 DP
1. Open the front panel of the CPU.
2. Pull the backup battery/accumulator
out of the compartment with a
screwdriver.
Pull the backup/rechargeable battery
out of the compartment with its cable.
3. Plug the connector of the new backup/rechargeable battery into the
corresponding socket in the battery compartment of the CPU. The notch on the
battery connector must show towards the left hand side.
4. Insert the new backup/rechargeable battery into the battery compartment of the
CPU.
5. Close the front door of the CPU.
Figure 9-5 Replacing the backup battery in CPU 313/314
How often do I have to replace it?
Backup battery: We recommend an annual replacement
Rechargeable battery: Never needs to be replaced.
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