This document discusses PROFINET, an industrial Ethernet standard for automation. It begins by outlining trends in automation toward distributed control structures, use of Ethernet at all levels, and integration of IT and automation standards. It then introduces PROFINET as the open standard that addresses these trends using Industrial Ethernet, TCP/IP, and real-time communication. The rest of the document discusses how PROFINET provides a comprehensive solution for real-time communication, distributed field devices, engineering tools, diagnostics, and applications like motion control and wireless communication. It concludes with a case study of how PROFINET was used with wireless communication for a high-bay warehouse.