TagAlarmPropertyOverride Function

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The TagAlarmPropertyOverride Function allows an operator to override a property of an Data Point Alarm Tag.

The function requests the property change using the AlarmPropertyOverride Tag Command. Code execution is suspended until the tag command completes.

Functions and Function Blocks

The TagAlarmPropertyOverride Function is intended for use in an Operator Action. Operator Actions run in response to user input gestures in the Operator Interface. In an Operator Action, code execution is suspended until the function completes.

There is currently no equivalent function block available.


Informal Syntax:

TagAlarmPropertyOverride( TagName, PropertyName, NewValue )

Formal Syntax:

        PropertyName :=Expression,
        NewValue := Expression )


TagNameANY_STRINGThe full name of the tag.
PropertyNameANY_STRINGThe property of the alarm to override.
NewValueANY_ELEMENTARYThe new property value.

Return Value



The TagAlarmPropertyOverride Function sends the AlarmPropertyOverride Tag Command to a database tag.

The user must have the TuneAlarm privilege for the database tag.

Further Information

AlarmPropertyOverride Tag Command

To learn about the AlarmPropertyOverride Tag Command.

Operator Actions

To learn where you can use this function.

Structured Text Function Call

To learn about calling a function from IEC 61131-3 structured text.

IEC 61131-3 Expressions

To learn about the different types of expression to use as function parameters.


For the meaning of terms used in Fernhill SCADA.