backup battery for siemens plc s7-400

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Hi I am using S7 414-2DP CPU with Flash EPROM with backup batteries, actually i want to know what is the use of memory card and Batteries.
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First to say... I'm a systems manager with wide interest in PLC's. But I'm New. We have a Symac C200He CPU42PLC in the house. Last sunday we have...
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hi i have some issue with battery in the electric smart meter the battery dies after 2 month they most work 5 year you can see the pic in the...
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