# Value connection (local message display)

The application reads the value of the connection at the data source and updates the local message display to show the message whose trigger value corresponds to the connection value.

A read connection. Assign a tag or an expression to this control. If you assign an expression, the application calculates the value of the expression and updates the display to show the message whose trigger value corresponds to the expression value.

The localMessageDisplay graphic object element's connections element contains this connection.

## See also

connections and connection elements