Rockwell-automation 9301 Series RSView32 Users Guide Instrukcja Użytkownika Pobierz pdf (Strona 142)

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For example, if the system detects that a tag is in alarm, it sets an

internal alarm bit, and resets the bit when the tag is out of alarm. The

following expression checks if a tag is in alarm:

ALM_IN_ALARM (tag)

where tag is the name of the tag you want to check for alarms. When a

tag is in alarm, the expression result is 1. When a tag is out of alarm,

the expression result is 0.

One way to use this expression is to animate the visibility of a graphic

object in a display. When the tag goes into alarm, the

ALM_IN_ALARM expression is set to 1, making the object visible.

This is an effective way to draw the operator’s attention to the alarm.

The following expression checks if an alarm has ever been

acknowledged:

ALM_ACK (tag)

The ALM_ACK expression returns 1 if an alarm has been

acknowledged. If a tag goes out of alarm without being acknowledged,

the expression returns 0.

When alarm monitoring starts and a tag has never been in alarm, the

ALM_ACK expression returns 1 by default. To reverse this default

behavior, use the Registry Configuration tool in the RSView32

Resource Kit.

™

For a copy of the Resource Kit, contact Rockwell

Software Technical Support.

ALM_ALLACKED (tag*)

The ALM_ALLACKED (tag*) expression returns 1 if all tags that

match the pattern have been acknowledged. If any of the tags have not

been acknowledged, the expression returns 0.

Other functions are also used with expressions to monitor alarms. For

more information, see Chapter 14, Creating expressions.

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