Rockwell-automation 1769-BOOLEAN Compact I/O Module Reference Manual Manuel d'utilisateur télécharger pdf (Page 19)

Publication 1769-RM016A-EN-P - July 2006

Module Operation 19

• In Case 2 the output will follow the state of the Boolean expression as

long as the configured delay time has expired and the Boolean

expression has maintained a TRUE state. When an output's Boolean

expression transitions from FALSE to TRUE, the output will be turned

ON only if the Boolean expression has maintained a state of TRUE for

the entire length of the delay time. If the output's Boolean expression

transitions to FALSE before the configured delay time expires, then the

delay time should be terminated and the output should not be turned

ON. If the output's Boolean expression has maintained a TRUE state

for the full length of the delay time, the output will be turned ON and

will remain ON until the Boolean expression becomes FALSE.

• If an output's Boolean expression is configured with both the delay and

duration times set to 0, then the output simply follows the state of the

Boolean expression, ON when the expression is TRUE and OFF when

it is FALSE.

Boolean Control Mode

Examples

The following examples illustrate the module's operation when an output is

configured in Boolean control mode. Examples 1…5 show module output

operation for Case 1 where the configured duration time is greater than 0.

Examples 6 and 7 show module operation for Case 2 where the configured

duration time is equal to 0.

Example 1: Duration > 0, Delay > TRUE Time

In this example, the output is configured with a duration time greater than 0, a

delay time greater than 0, and the configured delay time is longer than the time

that the Boolean expression remains TRUE.

Since the configured duration time is greater than 0, a “One-shot” pulse

occurs on the output. 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 even

though the Boolean expression transitions to FALSE. The second “One-shot”

pulse occurs on the output since there was a FALSE to TRUE transition in the

Boolean expression after the first “One-shot” pulse is completed.

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Rockwell-automation 1769-BOOLEAN Compact I/O Module Reference Manual Manuel d'utilisateur Page 19