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im151-8 DB retentivity

Created by: martinrelayer at: 3/2/2016 2:16 PM (3 Replies)

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3/2/2016 2:16 PM	Rate (0)
martinrelayer Posts: 60 Rating: (0)	hello, i have one im151-8 cpu, I have one DB variable that is not retaining its values after power off. DBs are supposed to be retained after a long power off problem? or should I use retentive M area?? Or it has to be a program issue?? thanks in advance, martin
martinrelayer Posts: 60 Rating: (0)
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3/2/2016 2:30 PM	Rate (0)
Kampi Posts: 366 Rating: (30)	Hi, is it the whole DB or just one value in it? When you program with TIA you have to set "Remanency" for each value separately. nice regards
Kampi Posts: 366 Rating: (30)
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3/2/2016 2:36 PM	Rate (0)
martinrelayer Posts: 60 Rating: (0)	i use step7 5.5 sorry i didn't mention that
martinrelayer Posts: 60 Rating: (0)
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3/2/2016 2:50 PM	Rate (0)
Wizard Diamond Expert Joined: 4/24/2006 Last visit: 5/16/2023 Posts: 8586 Rating: (1127)	Hello, Please have in mind, there is a limitation "The size of retentive memory for retentive data blocks" is 64 kbytes. Check if there are Datablocks that do not need retentivity. And then in properties you can deselect this option. Best regards, Wizard

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