Siemens SIMATIC S7-1200 System Manual page 1192

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Communication processor and Modbus TCP

13.5 Modbus communication

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, however, with V4.1 CPUs as well as V4.0 and earlier 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