Replacing The Back-Up Battery Or Rechargeable Battery (Cpus With Mc Only)10-9 - Siemens SIMATIC S7-300 Hardware And Installation Manual

10.5 Replacing the back-up battery or rechargeable battery (CPUs with
MC only)
Replacing the back-up battery or rechargeable battery (for CPUs with MC only)
Always 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.
Note
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:
Step
1. Open the front panel of the CPU.
2. Pull the back-up battery/accumulator
out of the compartment with a
screwdriver.
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.
S7-300 Programmable Controller Hardware and Installation
A5E00105492-02
CPU 313/314
Maintenance
CPU 314 IFM/315/315-2 DP/
316-2 DP/318-2 DP
Pull the back-up/rechargeable battery
out of the compartment with its cable.
10-9