This paper gives a short introduction to the history of development of fieldbuses and their standards in IEC and CENELEC in the area of industrial automation. It demonstrates the structure of the actual IEC 61158 standard with 18 different fieldbus systems and its relation to the European standards EN 50170, EN 50254 and EN 50325. The paper gives an introduction to the new IEC 61784 actually under vote. It give a short introduction how to use these profiles for reference and implementation of devices connected to these fieldbuses.