Bacher, R. Behrens, J.D. Delfs, T. Tempel, T. Wilgen, J. Wilksen, T. Technical Design Concept and First Steps in the Development of the New Accelerator Control System for PETRAIV JACoW Publishing Geneva, Switzerland 2226-0358 978-3-95450-238-7 10.18429/JACoW-ICALEPCS2023-TUPDP024 English 552-556 controls interface operation database software Contribution to a conference proceedings 2024 2024-02 https://doi.org/10.18429/JACoW-ICALEPCS2023-TUPDP024 https://jacow.org/icalepcs2023/papers/tupdp024.pdf At DESY, extensive technical planning and prototyping work is currently underway for the upgrade of the PETRAIII synchrotron light source to PETRAIV, a fourth-generation low-emittance machine. As part of this planned project, the accelerator control system will also be modernized. This paper reports on the main decisions taken in this context and gives an overview of the scope of the development and implementation work.