Chapter 9. PROFINET IO-Controller OverviewGFK-2816F August 2015 1999.2.2 Basic System: One RXi Controller using Multiple PortsThe illustration below shows a basic system consisting of an RXi Controller node controllingone PROFINET network. The network can connect up to 128 compatible IO-Devices,including any combination of GE Intelligent Platforms PROFINET Scanners and third-partyIO-Devices.This example shows an RXi Controller that is directly connected to two separate IO-Devicesin a star topology. Although each IO-Device is connected to a separate Ethernet port on thePNC, they are all on the same network. The IO-Devices in this example are VersaMaxPROFINET Scanners, but other types of IO-Devices can also be used.