Hi, we want to use Opta's RTC as a backup timer for when we lose power. The datasheet says it can live for ~10 days without power.
I set the time and then kept the PLC off. After 2 weeks, I turned it on and read the time. It had counted time for almost 2.5 days and then stopped at that time. I expect it to reset to 0 if it has not been running, otherwise we would just have a wrong time and we won't know that it is wrong.
Is that how it is supposed to be? It does not last 10 days and it also does not set a flag or reset the time when it finally loses power?