PROFIBUS was born out of a combined push by the German government, German companies, and other industry leaders in the late 1980s. PROFIBUS is not one communication system, but a variety of protocols built on the same field-bus technology bundle. PROFIBUS is a smart, field-bus technology. Devices on the system connect to a central line. Once connected, these devices can communicate information in an efficient manner, but can go beyond automation messages. PROFIBUS devices can also participate in self-diagnosis and connection diagnosis. At the most basic level, PROFIBUS benefits from superior design of its OSI layers and basic topology.