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Alarm suppression, Alarm functions in expressions – Rockwell Automation FactoryTalk View Site Edition Users Guide User Manual

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11

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ETTING

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HMI

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ALARMS

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One acknowledgment is all that is required for all previous and current alarms for a tag, so
alarm log files often show fewer acknowledgments than alarms.

Acknowledging alarms

To acknowledge HMI tag alarms, you can use any of these methods:

Click Acknowledge or Acknowledge All in the HMI tag alarm summary.

Use the FactoryTalk View command Acknowledge by itself, or with parameters to
name a tag or group of tags.

Use the FactoryTalk View command AcknowledgeAll. For details, see the
FactoryTalk View Site Edition Help.

Unacknowledged alarms remain outstanding until the HMI tag alarm summary is full,
alarm monitoring is turned off, or the system is shut down.

Alarm suppression

You can suppress alarm monitoring for single or multiple HMI tags. This is useful for
testing or for performing repairs or maintenance on a piece of equipment.

To suppress alarm monitoring, use the FactoryTalk View command SuppressOn. To view
a list of the tags not being monitored, use the Suppressed List. You can also turn
monitoring back on from this list.

For details about using the SuppressOn and SuppressOff commands, see the
FactoryTalk View Site Edition Help.

Alarm functions in expressions

When an HMI tag goes into alarm, or a FactoryTalk View SE alarm event occurs,
information about the alarm is recorded along with the value of the tag or alarm event.

Using expressions, you can retrieve this information on a tag-by-tag basis.

Checking for HMI tags in alarm

If the system detects that an HMI tag is in alarm, it sets an internal alarm bit, and then
resets the bit when the tag is out of alarm.

The following expression checks whether an HMI tag is in alarm:

ALM_IN_ALARM (tag)

where tag is the name of the HMI 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.