tations. The finished cartons are then transported to the filling machines via a clever carton logic system resembling a shunting yard. The various tea specialties are sorted into the arriving packages at the filling machines. Multiple light barriers, valves and motors help control this fully automatic process. CONTROL SYSTEM A PC controls the carton sealer utilizing the standardized IEC 1131-3 programming language. This type of program is based on high-level languages and permits the user program to be represented in a manner familiar to any PLC programmer, for example – as a standardized instruction list, ladder diagram or function block. The final packaging station is also controlled by INTERBUS. INTERBUS smart terminal I/O modules pickup the signals from the jam light barriers as well as the contactors which are also decentralized and used for activating the conv