so i have a micro 820 for a small project im working on and im having a **** of a time figuring out how im going to get a retentive timer to pick up where it left off on the power cycle since the controller looses all of its ET data.
-user enters timer MIN and SEC on panelview 800, easy using a UDFB that executes DINT to TIME
-display on HMI shows timer elapsed time, easy using a UDFB that executes TIME to DINT
issue becomes how to get this all to work on a power cycle properly, since as ive stated the RTO looses its TIMER ET value. so i have to not only diplay the prpoer elapsed time on the HMI still, but have the RTO continue its ET where it left off, which seems to not be working because im unable to just MOV a value into the timers ET on the first PLC scan like i thought i could and be on my way. been having a go at it for a few hours and im totally stumped, any suggestions would be greatly appreciated.
-user enters timer MIN and SEC on panelview 800, easy using a UDFB that executes DINT to TIME
-display on HMI shows timer elapsed time, easy using a UDFB that executes TIME to DINT
issue becomes how to get this all to work on a power cycle properly, since as ive stated the RTO looses its TIMER ET value. so i have to not only diplay the prpoer elapsed time on the HMI still, but have the RTO continue its ET where it left off, which seems to not be working because im unable to just MOV a value into the timers ET on the first PLC scan like i thought i could and be on my way. been having a go at it for a few hours and im totally stumped, any suggestions would be greatly appreciated.