Siemens S7-300 - Replacing the Back-Up Battery in CPU 313;314

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S7-300 Automation System, Hardware and Installation: CPU 312IFM - 318-2 DP
A5E00203919-01
10-9
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$OZD\V replace the back-up/rechargeable battery in POWER ON state of the CPU,
in order to avoid data loss in internal memory or stopping the real-time clock.
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Data in internal main memory will be lost if you replace the back-up battery in
POWER OFF state of the CPU.
Always replace the back-up battery in POWER ON state!
Replace the back-up/rechargeable battery as follows:
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1. Open the front panel of the CPU.
2. Pull the back-up battery/accumulator
out of the compartment with a
screwdriver.
Pull the back-up/rechargeable battery
out of the compartment with its cable.
3. Plug the connector of the new back-up/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 back-up/rechargeable battery into the battery compartment of the
CPU.
5. Close the front door of the CPU.
PS
CPU
Figure 10-5 Replacing the back-up battery in CPU 313/314