SIMATIC PN/M-Bus LINK coupling module for Profinet to M-Bus Fieldbus, M-Bus Master, IP20 As a stand-alone component, the SIMATIC PN/M-Bus Link forms a seamless transition between PROFINET and an M-Bus network. BACnet devices can thus be easily connected to a PROFINET network in order to communicate with SIMATIC components. This opens up a variety of options for easy implementation of modern production concepts as well as for existing plants and machines.