The BK9100 is an Ethernet TCP/IP bus coupler with 100Mbit/s speed, supporting 512 digital I/O and 128 analog I/O channels. It accommodates up to 64 bus terminals (expandable to 255 with K-bus extension) and features an integrated 2-channel switch. Compatible with Ethernet protocols including TwinCAT ADS and Modbus TCP, it also supports real-time Ethernet communication.