Integrated Ethernet switch functionality enables the 750-871 Ethernet TCP/IP 2-port programmable fieldbus controller to optimize networking capabilities while streamlining associated costs. The 750-871 is easily integrated into existing Ethernet networks while minimizing the overall number of components. The controller can link the WAGO-I/O-System to the Ethernet fieldbus and the dual RJ-45 Fieldbus ports daisychain up to 20 devices—each segment may be up to 100m long—within one series.