Siemens SIMATIC S7-1200 System Manual page 1148

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Communication processor and Modbus TCP

13.4 Universal serial interface (USS) communication

The blue arrows indicate the flow of bidirectional communication between devices.

With version V4.1 of the S7-1200, you can use the point-to-point instructions for all types of

point-to-point communication: serial, serial over PROFINET, and serial over PROFIBUS.

STEP 7 provides the legacy point-to-point instructions only to support existing programs. The

legacy instructions still function with all S7-1200 CPUs. You do not have to convert prior

programs from one set of instructions to the other.

S7-1200 Programmable controller

System Manual, V4.2, 09/2016, A5E02486680-AK