Differences between the PLX31 & PLX32 Gateways. For our PLX3x gateways that feature 2 Ethernet-based protocols (such as EtherNet/IP, Modbus/TCP, Profinet, and SIE) we offer 2 variants: the PLX31 and the PLX32. They are essentially identical except for one critical distinction.The PLX31 variant has a single Ethernet port, and s... Read more