TIA Portal library - Manual - AX2TIA - This package contains the documentation for ax2tia - Converting SIMATIC AX libraries to TIA Portal libraries,

FUNCTION Example : STRING
    VAR_INPUT  
        paraInputString : STRING;   
        paraInputStringArray : ARRAY[0..1] OF STRING[100];   
    END_VAR
    VAR_OUTPUT
        paraOutputString : STRING;   
        paraOutputStringArray : ARRAY[0..1] OF STRING[100];   
    END_VAR
    VAR_IN_OUT 
        paraInOutString : STRING;   
        paraInOutStringArray : ARRAY[0..1] OF STRING[100];   
    END_VAR
    ;
END_FUNCTION