Total Run ETM and Current Run ETM are easily programmed with appropriate triggers. Capturing the respective start and end points for use in Last or Previous Run ETM or a numeric experession is not obvious to me. Is it even possibly with out resorting to programming such functionality in a PLC? If so, how? Is there a programming example available or a guide?
I would suggest a sample object. Data = current run ETM, Sample = not running data member.
This will capture your current run etm value each time your equipment stops. You can display up to 31 previous samples (..\Sample1.1, ..\Sample1.2 etc)