A research project with the financial support of the German government defined in 1987 the fieldbus PROFIBUS based on the "Fieldbus Message Specification" (FMS). It showed in practical applications, that it was too complicated to handle in the field. In 1994 Siemens proposed a modified application layer with the name "Decentralized Periphery" (DP) which reached a good acceptance in the manufacturing industry. 2016 the Profibus is one of the most installed fieldbuses in the world and reaches 60 millions of installed nodes in 2018.