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FUNCTION_BLOCK TheFB
VAR_INPUT
    udtInput: IoDrvInput;
    udtConfig: IoDrvConfig;
END_VAR
VAR_OUTPUT
    udtOutput: IoDrvOutput;
END_VAR

// Implementation of the driver
udtInput.dwIn := udtOutput.dwOut * udtConfig.dwConfig;

VAR_GLOBAL
cClassID: DWORD;
cDriverName: string;
cDeviceName: string;
cVendorName: string;
cModuleType: WORD;
END_VAR