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Lose values every time I download

Created by: Dlabelle at: 1/25/2010 11:38 PM (5 Replies)

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1/25/2010 11:38 PM	Rate (0)
Dlabelle Regular Member Joined: 1/25/2010 Last visit: 8/6/2024 Posts: 4 Rating: (0)	I'm using a s7-1200 1212C CPU. Everytime I make a change to a FB and download it I lose all the values that have been entered in through the HMI. With the S7-200 when you went to download you could uncheck data block and all your entered values would remain unchanged. How do you do this with the s7-1200s.

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1/26/2010 7:22 AM	Rate (0)
Darius Platinum Member Joined: 9/28/2005 Last visit: 8/27/2024 Posts: 2957 Rating: (242)	Hi, What do you mean by saying "loose values". When ? After restart ? Keep in mind that by default data in DB are not retentive. You must check option for retentivity. Also please upgrade firmware of PLC because it has some issues with DB data. Look here http://support.automation.siemens.com/WW/view/en/34612486/133100 and choose appropriate PLC.
	Best regards, Darius
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1/26/2010 9:07 AM	Rate (0)
Wizard Diamond Member Joined: 4/24/2006 Last visit: 10/15/2024 Posts: 8745 Rating: (1168)	Dear Dlabelle, Please have a look at this link: how can you back up parameters before loading a new control programm? Best regards, Wizard

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1/26/2010 10:59 AM	Rate (1)
Denilson Pegaia Platinum Expert Joined: 9/23/2005 Last visit: 10/10/2024 Posts: 4349 Rating: (1446)	Hi, when you download, you overwrite the online DB values with the offline DB values. Mr.Wizard indicates a FAQ that shows to you how to actualise the offline DB values wiht the online values (to be done before the donwload).
	Denilson Pegaia Siemens Industry Sector Technical Support
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1/28/2010 9:35 AM	Rate (0)
HansAST Experienced Member Joined: 5/24/2009 Last visit: 10/10/2024 Posts: 90 Rating: (3)	Is there any idea when this issue will be resolved??? With bigger DB's this will become an issue... I think this is not the case for technology objects because you can upload these after optimizing into your project...

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1/28/2010 11:16 AM	Rate (0)
Denilson Pegaia Platinum Expert Joined: 9/23/2005 Last visit: 10/10/2024 Posts: 4349 Rating: (1446)	Hi, At this moment,the best solution comes from Mr. Wizard. I think that in the future it will possible easily upload the DB values and do partial downloads.
	Denilson Pegaia Siemens Industry Sector Technical Support
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