P0009¶

Code: P0009
Message: TwinCAT XML file has invalid structure

This error occurs when a TwinCAT XML file (.TcPOU, .TcGVL, or .TcDUT) does not have the expected structure. TwinCAT files must have a TcPlcObject root element containing a POU, GVL, or DUT child element with a Declaration section.

Example¶

The following XML is missing the required Declaration element:

<?xml version="1.0" encoding="utf-8"?>
<TcPlcObject Version="1.1.0.1">
  <POU Name="MAIN" Id="{00000000-0000-0000-0000-000000000000}">
    <Implementation>
      <ST><![CDATA[
myVar := myVar + 1;
      ]]></ST>
    </Implementation>
  </POU>
</TcPlcObject>

To fix this error, add a Declaration element containing the variable declarations:

<?xml version="1.0" encoding="utf-8"?>
<TcPlcObject Version="1.1.0.1">
  <POU Name="MAIN" Id="{00000000-0000-0000-0000-000000000000}">
    <Declaration><![CDATA[
PROGRAM MAIN
VAR
    myVar : INT;
END_VAR
    ]]></Declaration>
    <Implementation>
      <ST><![CDATA[
myVar := myVar + 1;
      ]]></ST>
    </Implementation>
  </POU>
</TcPlcObject>