Sample Ethernet Network Configurations - Siemens SIMATIC S7 System Manual

8.4.3

Sample Ethernet network configurations

You have three different types of communication options when using the
S7-200 SMART CPU Ethernet network:
● Connecting a CPU to a programming device
● Connecting a CPU to an HMI
● Connecting a CPU to another S7-200 SMART CPU
The Ethernet 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
switch.
You can use the rack-mounted CSM1277 4-port Ethernet switch for connecting multiple
CPUs and HMI devices.
S7-200 SMART
System Manual, V2.3, 07/2017, A5E03822230-AF
Programming device connected to the CPU
HMI connected to the CPU
A CPU connected to another CPU
Communication
8.4 Ethernet
①
CSM1277 Ether-
net switch
401