Head of the network: AS-i master
The AS-Interface master serves as the link to superior controls. It automatically organizes the data traffic on the AS-i cable. A differentiation is made between AS-i masters for direct installation in a SIMATIC unit (CPs or CMs) and AS-i links which are used as sub-system in PROFINETor PROFIBUS-based applications. Up to two AS-i networks can be connected to one AS-i link (double master). The F-link represents the safety-related version of an AS-i link.