What type of timer retains its accumulated value even when de-energized?

A retentive timer is specifically designed to hold its accumulated time value even after it has been de-energized. This means that when power is restored, the timer continues from the last accumulated value rather than starting over from zero. This feature is particularly useful in applications where it is critical to maintain an accurate measurement of time regardless of power interruptions.

In contrast, standard timers typically reset their values when de-energized, starting fresh each time they are powered on. On-delay and off-delay timers serve specific functions related to the timing duration before or after an event occurs, but they too do not retain their timing values once they lose power.

Understanding the retentive timer's function is crucial for applications requiring precise timing operations that are consistent through power cycles.