Replacing The Back-Up Battery In Cpu 313/314 - Siemens S7-300 Installation Manual

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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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2.
3.
4.
5.
Figure 10-5 Replacing the back-up battery in CPU 313/314
S7-300 Automation System, Hardware and Installation: CPU 312IFM - 318-2 DP
A5E00203919-01
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Open the front panel of the CPU.
Pull the back-up battery/accumulator
out of the compartment with a
screwdriver.
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.
Insert the new back-up/rechargeable battery into the battery compartment of the
CPU.
Close the front door of the CPU.
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Pull the back-up/rechargeable battery
out of the compartment with its cable.
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10-9