PROFINET is a real-time Ethernet standard for the high-speed, deterministic communications required for a wide range of industrial applications including factory automation, process automation and building automation. Originally developed under the leadership of Siemens GmbH as a network extension to the popular PROFIBUS fieldbus technology, PROFINET is now supported by PROFIBUS & PROFINET International, the largest fieldbus organization in the world. In 2003, PROFINET was integrated into the IEC 61158 and IEC 61784 standards. Its architecture was developed by 30 working groups whose members represented more than 70 different companies.