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Fault of Dowload Datablock

Created by: Dien1394 at: 8/29/2022 4:50 AM (8 Replies)

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8/29/2022 4:50 AM	Rate (0)
Dien1394 Member Joined: 8/29/2022 Last visit: 9/30/2025 Posts: 17 Rating: (0)	Hi everyone. I got a problem when i dowloaded the datablock on PLC First of all, i modify a lot in datablock and save it. Finally, i was dowloading the datablock in PLC. Everything is ok but i got a problem. The value in HMI always come back to inital value like 0 My PLC is S7-300 and i setting PG/PC by Profibus. And i dowload when plc is run status How can i fix this problem ?, Thank for reading and supposting. Sorry for my english skill
	Last edited by: HonCaYeu1994 at: 08/29/2022 04:51:53 Last edited by: HonCaYeu1994 at: 08/29/2022 06:15:45
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8/29/2022 6:21 AM	Rate (0)
itafusna Gold Member Joined: 2/17/2020 Last visit: 1/19/2026 Posts: 1251 Rating: (237)	Hi, Have you made any changes to the DB structure, such as adding a tag, before the download? If so, this is normal behavior as the CPU resets the data in the DB. If the structure remains the same, you can copy the online DB folder to the offline project to keep the values of the tags.
	A rating will be well appreciated.
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8/29/2022 6:43 AM	Rate (0)
SCOTT123 Silver Member Joined: 10/16/2007 Last visit: 12/11/2025 Posts: 658 Rating: (46)	Hello, where is the value in the DB normally coming from? Do you insert it through the HMI? Can you watch online the values of the DB? Scott

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8/29/2022 6:54 AM	Rate (0)
Dien1394 Member Joined: 8/29/2022 Last visit: 9/30/2025 Posts: 17 Rating: (0)	itafusna Hi, Have you made any changes to the DB structure, such as adding a tag, before the download? If so, this is normal behavior as the CPU resets the data in the DB. If the structure remains the same, you can copy the online DB folder to the offline project to keep the values of the tags. Hi sir The DB actually have in Project before. I just add some new address like DB100.DBD700

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8/29/2022 6:59 AM	Rate (0)
Dien1394 Member Joined: 8/29/2022 Last visit: 9/30/2025 Posts: 17 Rating: (0)	SCOTT123 Hello, where is the value in the DB normally coming from? Do you insert it through the HMI? Can you watch online the values of the DB? Scott The value in DB take a tag in HMI sir. I got aproblem when i dowload the value is always inital value

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8/29/2022 12:57 PM	Rate (0)
SCOTT123 Silver Member Joined: 10/16/2007 Last visit: 12/11/2025 Posts: 658 Rating: (46)	If you download the DB from your computer to the plc it is normal that you get initial values.

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8/30/2022 4:33 AM	Rate (0)
Dien1394 Member Joined: 8/29/2022 Last visit: 9/30/2025 Posts: 17 Rating: (0)	Thanks for suporting me. I got it, but i am trying to save the old value. Maybe i need creat a new DB Thank you very much
	Last edited by: HonCaYeu1994 at: 08/30/2022 04:35:19
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8/30/2022 7:58 AM	Rate (0)
SCOTT123 Silver Member Joined: 10/16/2007 Last visit: 12/11/2025 Posts: 658 Rating: (46)	You could create a button on the panel for transferring the values from the original DB to another and another button to transfer the values back to the first DB.

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8/31/2022 3:53 AM	Rate (0)
Dien1394 Member Joined: 8/29/2022 Last visit: 9/30/2025 Posts: 17 Rating: (0)	Thanks for supporting sir

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