Siemens SIMATIC S7 System Manual page 395

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The CPU can communicate with other CPUs, with programming devices, with HMI devices,

and with non-Siemens devices using standard TCP communications protocols.

The PROFINET port on the CPU 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

You can use the rack-mounted CSM1277 4-port Ethernet switch for connecting multiple

CPUs and HMI devices.

S7-1200 Programmable controller

System Manual, 11/2011, A5E02486680-05

103BCommunication

Programming device connected to the

HMI connected to the CPU

A CPU connected to another CPU

10.2 PROFINET

Ethernet switch

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Simatic s7-1200