Hello every one,

       I want to know about Battery selector switch which is on Power supply module.

My S7-400H CPU have External RAM Memory. I have inserted two batteries in battery slot of Power supply module. Now "BATT1F" LED is lit, showing that battery 1 is discharged. 2nd battery is ok (BATT2F LED not lit). 

My question is, if only one battery is working, what should be the Battery Selector switch position to protect CPU program after power failure..?? in above case, Can we select selector switch position to "2 Batt"...??

Thanks in advance

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Sachin

Dear hdhosseini ,

               Thank you for your valuable information, now I understand the function of Battery selector switch.

Regards

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Sachin