BuildingSystems.Controls.Continuous.OffTimer

# .BuildingSystems.Controls.Continuous.OffTimer

Records the time since the input changed to false

## Information

Timer that starts at the initial time with a value of 0, and gets reset each time the input signal switches to `false`.

For example, if the simulation starts at t = 10 and at t=11, the input becomes `false`, then the timer outputs y=t-10 for t < 11, and y=t-11 afterwards, unless the input becomes false again.

## Revisions

- May 12, 2017, by Michael Wetter:
  Corrected implementation for non-zero start time.
  This is for issue 780.
- January 4, 2011, by Wangda Zuo and Michael Wetter:
  Revised implementation.
- February 12, 2009, by Michael Wetter:
  First implementation.

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