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S7-300 Data block download to PLC

Created by: Alidemir at: 1/20/2012 8:58 PM (3 Replies)

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1/20/2012 8:58 PM	Rate (0)
Alidemir Posts: 7 Rating: (0)	Hello, I want to send backup program to S7-300 PLC. I open backup project and idownload to PLC. Just Datablock value isn'tdownloading to PLC. For example Motor gear value is different betweenonline and offline.Iam checking backup datablock.There ara all values in backup datablock. How can i send datablock values to PLC?
Alidemir Posts: 7 Rating: (0)
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1/21/2012 7:56 AM	Rate (0)
UMENCHO Diamond Member Joined: 3/21/2006 Last visit: 9/10/2024 Posts: 10228 Rating: (1181)	What is the significance of the initial and actual values of a data block? What does the terms Initial value (declaration view), Initial value (load memory) and Actual value mean in data blocks when a controller is loaded / restarted?

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1/21/2012 4:23 PM	Rate (0)
Marciel Posts: 21 Rating: (3)	Hello Alidemir, If I understand your question, always when you go to download a DB, first you must upload the current DB to PG , then you change it, now you can to download the DB to PLC. The DB present in backup program have different actual values than the program in PLC. I hope I have helped you! Best Regards ! Marciel Fernandes ^{Automation Trainee}
Marciel Posts: 21 Rating: (3)
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1/21/2012 7:40 PM	Rate (0)
Alidemir Posts: 7 Rating: (0)	I checked PLC datablock and i see that PLC datablock and my offline backup program is the same. Butdatablock initial value and actual value is different. I tried PLC key reset (run-stop-mres-stop-mres-stop) ordelete all block in the online PLC.After i send backup to PLC.DB's Initial value isn't writing to actual value. For example motor gear value is writing 3.000000e+001 at the initial value but actual value is writing zero. There are a lot of values in the data block. Why I can not seeactual value? I changed PLC and MMC but the problem is continuing.
Alidemir Posts: 7 Rating: (0)
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