ChangeUser Function

Help Contents


The ChangeUser function attempts to change the currently logged on user.


Informal Syntax:

ChangeUser( Username, Password )

Formal Syntax:

ChangeUser( Username:=Expression, Password:=Expression )


UsernameANY_STRINGThe name of the user.
PasswordANY_STRINGThe password of the user.

Return Value

Returns a BOOL value that indicates whether the ChangeUser function succeeded:


The Username and Password parameters are validated by the Fernhill SCADA Server.


  1. Changes the current user to "Supervisor".
    ChangeUser( "Supervisor", "********" );

    Note: The password parameter is not shown for security reasons.

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.

DialogAddPasswordEntry function

To learn how to add a password entry field to a dialog.

IEC 61131-3 Expressions

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

ChangeUser Function Block

For a function block to provide the equivalent feature in an IEC 61131-3 Program Tag.


For the meaning of terms used in Fernhill SCADA.