A method and arrangement for commissioning an updated application for an industrial automation arrangement, wherein a first, existing application on a first controller and the updated application on a test device are executed in parallel, where local software (in particular a proxy service (proxy)) writes sensor data to the process image of a separate test device, where memory cells (e.g., I/O values, variables or registers) not yet belonging to the local process image of the test device are applied or allocated there, such that the “external” data and values of the productive system (first controller) are available in the local process image of the test device, without needing to change the production version of the application or the version of the application to be tested, and where the output values of the updated application are tested; if successful, the updated application is cleared for operation.