Patent ID: 7983115

Claim:
A time management method for automatic control equipment comprising: counting, at a first clock having a first counter storing a first value, based on a first time base; counting, at a second clock having a second counter storing a second value, based on a second time base identical to the first time base; counting, at a third counter of the second clock, based on a third time base that is quicker than the second time base; powering, at a main electrical power supply, the first and second clocks; powering, at an auxiliary electrical power supply, the first clock in response to a main electrical power supply outage; performing, at a central processing unit, a periodic synchronization between the first counter and the second counter by loading the second value of the second counter into the first counter when the first counter is different from the second counter; and performing, at the central processing unit, in response to the main electrical power supply being restored, a resynchronization of the second clock, based on a modification of the first counter, by loading the first value of the first counter into the second counter and zeroing the third counter wherein the first clock is based only on the first time base, and the second clock is based only on the second and third time bases.