The 6ES7151-3BA00-0AB0 is a SIMATIC DP interface module — specifically the IM151-3 PROFINET High Feature — for the Siemens ET 200S distributed I/O family. It handles bus communication at up to 100 Mbit/s over two RJ45 ports and can connect up to 63 peripheral modules of up to 2 m width each. An integrated terminating module is included, so you don't need a separate bus terminator on the last station.
Mount it on the DIN rail in an ET 200S station. The PROFINET High Feature handles bus communication at up to 100 Mbit/s over RJ45 and supports up to 63 peripheral modules of up to 2 m width.