Rockwell-automation 1769-BOOLEAN Compact I/O Module Reference Manual User Manual download pdf (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.

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Rockwell-automation 1769-BOOLEAN Compact I/O Module Reference Manual User Manual Page 22