I´ve got the folowing time series data
where 1 is my actual value, 0 is the last known good value. and i´ve got several "out of serv" values corresponging to a comunication failure with the PLC.
I need to get the current value (thats easy with the analysis) and compare it with the previous known good value (0 in this case) to identify a change in that attribute. preval function needs an specifyc timestamp to get the value but that timestamp is unkown.
How can this be achieved? any ideas?
in this example i´ve got only a couple of minutes between the 0 and the 1 but it may be days or months.