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SIMATIC S7-315-2 DP retentive memory problem

Created by: zdenek82 at: 6/27/2008 7:17 AM (2 Replies)

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6/27/2008 7:17 AM	Rate (0)
zdenek82 Posts: 14 Rating: (0)	Hello, I made project in SIMATIC S7-315-2DP and I have set all my DB as NON-RETAIN. But when PLC lost power in all DB block was init values. Where is a problem ? I thing I have enough memory on MMC card and I have only 3 small DB.
zdenek82 Posts: 14 Rating: (0)
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6/27/2008 9:35 AM	Rate (0)
GrzegorzG Posts: 63 Rating: (19)	If you want DB's to keep their values after power down and power up, you cannot configure them as non-retain, since they are created in PLC memory during power up with initial values. Only retain DB's keep their actual values. Simply change DB attributes and download them to the PLC.
GrzegorzG Posts: 63 Rating: (19)
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6/27/2008 9:57 AM	Rate (0)
zdenek82 Posts: 14 Rating: (0)	I wrote it wrong. I have all DB set as retain(disable Non-retain attribute of DB) and it doesnt function.
zdenek82 Posts: 14 Rating: (0)
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