A central material drying and handling system, which delivers materials to all processing machines in a plastics production plant, is often accessible to all staff members working on such a production floor. Therefore it requires special security measures. Well-planned central systems offer several different options in this area. For instance, the appliances included in a central system from WITTMANN can be blocked by a key lock function, or the entire system can be protected in such a way that login to its individual components is only possible by entering a user name and password. Alternatively, a user administration can be installed which can be operated via RFID cards.