TagWriteValueQuality Function

Help Contents


Writes a value and quality to a tag using the WriteValueQuality Tag Command.

Functions and Function Blocks

The TagWriteValueQuality 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.

To write a value and quality from a Program Tag, running on the SCADA Server, use the TagWriteValueQualityFB Function Block.


Informal Syntax:

TagWriteValueQuality( TagName, Value, Quality )

Formal Syntax:

        Quality:=Expression )


TagNameANY_STRINGThe full name of the tag.
ValueANYThe value to write to the tag.
QualityINTThe quality to write to the tag.

Return Value



The TagWriteValueQuality Function sends the WriteValueQuality Tag Command to the database tag.

Further Information

WriteValueQuality Tag Command

To learn about the WriteValueQuality Tag Command.

TagWriteValueQualityFB Function Block

To learn how to write value and quality to a tag from a Program Tag.

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.