Siemens S7-300 - Insert a Back-Up Battery into Cpus 313;314

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S7-300 Automation System, Hardware and Installation: CPU 312IFM - 318-2 DP
9-6 A5E00203919-01
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Insert a back-up/rechargeable battery in the CPU as follows:
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Do not insert the back-up battery in the CPU until after POWER ON.
If you insert the back-up battery before POWER ON, the CPU requests a memory
reset.
1. Open the front panel of the CPU.
2. Plug the connector of the back-up/rechargeable battery into the corresponding
socket in the battery compartment of the CPU. The notch on the connector must
show towards the left hand side.
3. Insert the back-up/rechargeable battery into the battery compartment of the
CPU.
4. Close the front door of the CPU.
Figure 9-1 Insert a back-up battery into CPUs 313/314