The TwinCAT PROFINET RT Device (slave) is a supplement that turns any PC-based controller with an Intel? chipset and the real-time Ethernet driver developed by Beckhoff into a PROFINET RT device. By installing the function, a standard Ethernet interface becomes a PROFINET slave. Download note: Please license only, it is included in the installation of TwinCAT?3.1 - eXtended Automation Engineering (XAE).