今天看西门子英文手册的时候有一句话不太明白，大家给看看。
Replace buffer battery of S7-400
1. Discharge your body by touching the ground
2. Make sure nobody switches off supply voltage during the change (otherwise data gets lost)
3. Set BATT INDIC to OFF then you will get no alert during change
4. Take out the battery by pulling the starp
5. Insert the new battery
6. Set BATT INDIC to BATT to get the faults again
7. If you get a fault try to reset it with FMR
就是第一句，改怎么翻译