Rockwell Automation 1769-BOOLEAN Compact I/O Module Reference Manual - Manual (Page 22)

Publication 1769-RM016A-EN-P - July 2006
22 Module Operation
Example 3: Duration > 0, Delay < TRUE Time, Retriggering Ignored
In this example, the output is configured with a duration time greater than 0, a
delay time greater than 0, and multiple transitions of the Boolean expression
occur before the initial “One-shot” pulse duration is completed.
The first FALSE to TRUE transition of the Boolean expression causes a
“One-shot” pulse to occur. The pulse starts an amount of time after the
FALSE to TRUE transition of the Boolean expression equal to the configured
delay time. The “One-shot” pulse lasts as long as the configured duration time.
Since the second FALSE to TRUE transition of the Boolean expression occurs
before the initial “One-shot” pulse is completed, that transition of the Boolean
expression is ignored by the module. The third FALSE to TRUE transition of
the Boolean expression again causes a “One-shot” pulse, with the fourth
FALSE to TRUE transition of the Boolean expression again ignored by the
module since it occurs before the second “One-shot” pulse is complete.