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SIEMENS Simatic S7

S7comm (S7 Communication) is a Siemens proprietary protocol that runs between programmable logic controllers (PLCs) of the Siemens S7-300/400 family.

It is used for PLC programming, exchanging data between PLCs, accessing PLC data from SCADA (supervisory control and data acquisition) systems and diagnostic purposes.

The S7comm data comes as payload of COTP data packets, the first byte is always 0x32 as protocol identifier, special communication processors for the S7-400 series (CP 443) may use this protocol without the TCP/IP layers.

The protocol is used by Siemens since the Simatic S7 product series was launched in 1994.

The protocol is also used on top of other physical/network layers, like RS-485 with MPI (Multi-Point-Interface) or Profibus.

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