Operational Technology (OT) and Information Technology (IT) used to be separate for decades, as there was simply no reason to integrate those two areas. Stable OT systems were basically left untouched during the lifetime of a production plant, while IT has always had the reputation of needing frequent changes and being vulnerable to cyber security issues. Nowadays, the concepts of digitalization, Industry 4.0 and IIoT make the convergence of IT/OT mandatory, in order to optimize business models and production agility.