If the speed values are over “High threshold” value or under “Low threshold – Hysteresis”
value then the state of the window comparator is “OUT OF WINDOW”.
If the state of the window comparator is “IN WINDOW” and speed values are under “High
threshold” value or over “Low threshold – Hysteresis” value, then the state of the window
comparator still remains “IN WINDOW”.
If the state of the window comparator is “OUT OF WINDOW” and measurement values are
over “High threshold – Hysteresis” value or under “Low threshold” value then the state of
the window comparator still remains “OUT OF WINDOW”.
The window comparator turns its state into “IN WINDOW” only if the measurement values
are under “High threshold – Hysteresis” value or over “Low threshold” value.
In the following figure is given an example of the behavior of the window comparator.
Example of window comparator behavior
When the window comparator is not enabled, the output state of the threshold
comparator depends on the value of the measurement and on its current state.
There are two possible states:
➔
OVER THRESHOLD: the output of the comparator is a logic 1 (TRUE)
➔
UNDER THRESHOLD: the output of the comparator is a logic 0 (FALSE)
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