Specifications

TH230/230+ Programmer’s Guide
279
Calculating Power On Time
The Power on time is calculated by subtracting the Power on counter from the EEPROM
update counter and dividing afterwards by 4. This calculation of the Power on time is
correct, because the EEPROM update counter is increased and saved every 15 minutes.
In special situations the EEPROM is updated additionally and then the Power on count is
increased. This occurs every time when the Revision level counter was changed.
Due to this procedure, the Power on counter could be increased before the 15 minute
period was passed. This means that with every change of the revision counter the
calculated Power on time could have an error of maximum 15 minutes.
This is not significant, because the Revision level counter is not changed very often and
then only by service personnel.