LabVIEW Datalogging and Supervisory Control Module Programming Reference Manual

Read Tag Alarms (Live, Multiple) VI

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Updated2024-11-20
4 minute(s) read

Reads alarms for the specified tags, processes, or alarm areas. You must manually select the polymorphic instance to use.

Note This VI interacts with data in the Citadel database only.

Use the pull-down menu to select an instance of this VI.

Inputs/Outputs

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Tag Reader in specifies the data of a group of tags that the Open Tag Reader VI opens.

tag names —

tag names specifies the list of tags for which you want to acknowledge alarms.

timeout (s) —

timeout specifies the maximum time, in seconds, that this VI waits for reading data from the Shared Variable Engine (SVE). The default is 5. A timeout value of less than or equal to 0 specifies no timeout, which means this VI waits indefinitely until this VI receives data from the SVE.

error in (no error) —

error in describes error conditions that occur before this node runs. This input provides standard error in functionality.

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Tag Reader out returns data of the tags that this VI opens.

alarms —

alarms returns the alarm information for the specified shared variables, processes, or alarm areas.

alarm URL —

alarm URL returns the name of the alarm.

set time —

set time returns the time that the alarm occurred.

set user —

set user returns the user who was logged in when the alarm activated.

ack time —

ack time returns the time that the alarm was acknowledged.

ack user —

ack user returns the user who acknowledged the alarm.

clear time —

clear time returns the time that the alarm was cleared.

clear user —

clear user returns the user who cleared the alarm.

setpoint —

setpoint returns the value of the shared variable at the time when the alarm occurred.

value —

value returns the shared variable value when it changes alarm states. The shared variable value updates only when the shared variable changes alarm states and is not necessarily the most recent alarm value.