OpenTagFile Function

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Displays a file associated with a tag.


Informal Syntax:

OpenTagFile( TagName, FileType )

Formal Syntax:

OpenTagFile( TagName:=Expression, FileType:=Expression )


TagName ANY_STRING The name of the tag to open the file for. The name can be the full name of the tag or a relative tag name.
FileType ANY_STRING The type of file to open.
The FileType parameter can be one of the following values:
  • "Graphic" - opens a graphic page
  • "Trend" - opens a trend

Return Value



The OpenTagFile function displays a Tag File. The exact behavior varies according to the context:

If the OpenTagFile call is made from a Graphic Page Tag you can use a relative tag name for the TagName parameter. A relative tag name is a name relative to the host document. For more information on how relative names are resolved see Tag References.

A program or script will not execute any statements after the OpenTagFile call.


  1. Display the trend plot 'Storage.TankLevel':
    OpenTagFile( "Storage.TankLevel", "Trend" );

Further Information

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.