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Data of data logging is lost after S7-1200 CPU restarts

Created by: HaBoo at: 5/11/2012 6:32 PM (4 Replies)

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5/11/2012 6:32 PM	Rate (0)
HaBoo Posts: 3 Rating: (0)	Hi all, Could you pls help: I am writing data logging of S7-1200, CPU 1214C. It works well except one thing: That's everytime I turn on the CPU (power off, then On again), the data of previous runtime in data log is lost. I want to keep the data of previous runtime and continue to write new data into data log. I use the DatalogOpen function with mode 0 but it doesnt keep data. Thanks.
HaBoo Posts: 3 Rating: (0)
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5/14/2012 5:32 PM	Rate (0)
Tomy Master Platinum Member Joined: 5/4/2009 Last visit: 1/1/2026 Posts: 916 Rating: (40)	Is your "DATA" retentive? Regards.
	Aim Higher
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5/14/2012 5:47 PM	Rate (0)
0_Einstein Grandmaster-Expert Joined: 7/7/2010 Last visit: 1/14/2026 Posts: 16369 Rating: (2522)	HaBoo Hi all, Could you pls help: I am writing data logging of S7-1200, CPU 1214C. It works well except one thing: That's everytime I turn on the CPU (power off, then On again), the data of previous runtime in data log is lost. I want to keep the data of previous runtime and continue to write new data into data log. I use the DatalogOpen function with mode 0 but it doesnt keep data. Thanks. Is it possible you are opening a different datalog file each time the plc powers on? How about temporarily disabling all your data log plc logic, restart the plc, then access the data logs via the web server. If the data is still there, your logic may have problems. It is also possible your plc firmware and software are not the latest. Is the plc firmware 2.2 and TIA Portal V11 SP2 Update 2 (or higher)? Perhaps do screenshots of the data log create, open, etc. logic? Do you have any first scan logic associated with creating the first data log that may be resetting or creating a new data log?
	science guy
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5/17/2012 6:32 PM	Rate (0)
Martins_Eng Experienced Member Joined: 7/17/2010 Last visit: 11/12/2025 Posts: 189 Rating: (0)	Depending on the mode you are writing it will restart when rewriting the values already recorded previously. It is possible you make a count of pulses written so that when he makes a shutdown serado store the last pulse sequence and from this point forward.

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6/8/2012 10:45 AM	Rate (0)
HaBoo Posts: 3 Rating: (0)	Dear all, Thanks for your support. I've upgraded CPU to firmware 2.2 and the data is kept after CPU restart. So the problem comes from version of firmware. Best regards,
HaBoo Posts: 3 Rating: (0)
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