The Siemens S7 protocol has been detected.
S7 is a Siemens proprietary communications protocol. The S7 communications protocol is used extensively in the Siemens S7 software and device product line including the S7-200, S7-300, and S7-400 programmable logic controllers (PLCs). S7 can be encapsulated in several different protocols including PROFIBUS, MPI, and TCP. The S7 traffic detected here is encapsulated in TCP using TPKT and COTP.