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SIMATIC WinCC (TIA Portal): Report Variable every second Upon trigger Occurrence

Hello everyone! 
I would be very thankful if someone can help me. 
I need to log my tag every second on trigger event (when I exceed set value). And I need to log it until it falls below the set value. I don't know for how long that will take and because of that I don't know how many data records per log I should define. I need to save that logs for a long period and display some of them on a trend view after selection. Should I use long-term archiving (and if YES, do I need to define exact data records per log) or should I write my script for writing that tag in a csv every second? I'm trying to find the best way for doing that. Software is WinCC Advanced 15.1 (PC station).
I hope I listed everything you should know. Thank you! 
 
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Split from
WinCC RT advanced Historical Data
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