Siemens S7-1200 System Manual page 513

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Ethernet switching

The PROFINET port on the CPU 1211C, 1212C, and 1214C does not contain an Ethernet

switching device. A direct connection between a programming device or HMI and a CPU

does not require an Ethernet switch. However, a network with more than two CPUs or HMI

devices requires an Ethernet switch.

The CPU 1215C and the CPU 1217C have a built-in 2-port Ethernet switch. You can have a

network with a CPU 1215C and two other S7-1200 CPUs. You can also use the rack-

mounted CSM1277 4-port Ethernet switch for connecting multiple CPUs and HMI devices.

S7-1200 Programmable controller

System Manual, 03/2014, A5E02486680-AG

Communication

10.2 PROFINET

Ethernet switch