8–24
Triggers and When to Use Them
Edge-Qualified with Wait Like its State-Qualified equivalent, Edge-Qualified with Wait
(Fig. 8–18) is conditioned by Time and Events:
Ø Time Selects a delay from the start of the desired pattern.
After the delay (timeout) and before the end of the pattern, a
trigger can occur. The timing for the delay is restarted when
the selected pattern begins.
Ø Events selects a minimum number of events of the trigger
source. An event is generated when a trigger source meets
its trigger conditions. On the selected event of the trigger
source and before the end of the pattern, a trigger can
occur. The count is initialized and started whenever the
selected pattern begins. It continues while the pattern
remains. When the selected count is reached, the trigger
occurs.
Figure 8–18. Edge-Qualified by Wait: Trigger after timeout.
T
Selected time
T
Trigger Source: Positive Slope
Qualifier: Pattern Present
Trigger can occur
Generated Trigger
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