Siemens SIMATIC S7-1200 System Manual page 1147

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USS communications through PROFIBUS or PROFINET

As of version V4.1 of the S7-1200 CPU together with STEP 7 V13 SP1, the CPU extends the

capability of USS to use a PROFINET or PROFIBUS distributed I/O rack to communicate to

various devices (RFID readers, GPS device, and others):

● PROFINET (Page 804): You connect the Ethernet interface of the S7-1200 CPU to a

PROFINET interface module. PtP communication modules in the rack with the interface

module can then provide serial communications to the PtP devices.

● PROFIBUS (Page 968): You insert a PROFIBUS communication module in the left side

of the rack with the S7-1200 CPU. You connect the PROFIBUS communication module

to a rack containing a PROFIBUS interface module. PtP communication modules in the

rack with the interface module can then provide serial communications to the PtP

For this reason, the S7-1200 supports two sets of PtP instructions:

● Legacy USS instructions (Page 1239): These USS instructions existed prior to version

V4.0 of the S7-1200 and only work with serial communications using a CM 1241

communication module or CB 1241 communication board.

● USS instructions (Page 1153): These USS instructions provide all of the functionality of

the legacy instructions, plus the ability to connect to PROFINET and PROFIBUS

distributed I/O. These USS instructions allow you to configure the communications

between the PtP communication modules in the distributed I/O rack and the PtP devices.

S7-1200 CM 1241 modules must have a minimum firmware version of V2.1 to use these

USS instructions.

S7-1200 Programmable controller

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

Communication processor and Modbus TCP

13.4 Universal serial interface (USS) communication