In automation sensor and application data from machines are transmitted from the field level to a central control unit. Moving parts, e.g. in sewage treatment plants or cranes, require wireless communication solutions for the different protocols (fieldbus). Therefore, radio links are used. The DATAEAGLE 4000 modules “speak PROFINET“ and provide for communication in wireless network areas with highest reliability – thanks to their filter function patented by Schildknecht against lost or damaged telegrams. No bus errors anymore cause by interferences!