Configuring An Ip Address For A Cpu In Your Project - Siemens SIMATIC S7 System Manual

5.6.4.4

Configuring an IP address for a CPU in your project

Configuring the PROFINET interface
To configure parameters for the PROFINET interface, select the green PROFINET box on
the CPU. The "Properties" tab in the inspector window displays the PROFINET port.
①
Configuring the IP address
Ethernet (MAC) address: In a PROFINET network, each device is assigned a Media Access
Control address (MAC address) by the manufacturer for identification. A MAC address
consists of six groups of two hexadecimal digits, separated by hyphens (-) or colons (:), in
transmission order, (for example, 01-23-45-67-89-AB or 01:23:45:67:89:AB).
IP address: Each device must also have an Internet Protocol (IP) address. This address
allows the device to deliver data on a more complex, routed network.
Each IP address is divided into four 8-bit segments and is expressed in a dotted, decimal
format (for example, 211.154.184.16). The first part of the IP address is used for the Network
ID (What network are you on?), and the second part of the address is for the Host ID (unique
for each device on the network). An IP address of 192.168.x.y is a standard designation
recognized as part of a private network that is not routed on the Internet.
Subnet mask: A subnet is a logical grouping of connected network devices. Nodes on a
subnet tend to be located in close physical proximity to each other on a Local Area Network
(LAN). A mask (known as the subnet mask or network mask) defines the boundaries of an IP
subnet.
A subnet mask of 255.255.255.0 is generally suitable for a small local network. This means
that all IP addresses on this network should have the same first 3 octets, and the various
devices on this network are identified by the last octet (8-bit field). An example of this is to
assign a subnet mask of 255.255.255.0 and an IP addresses of 192.168.2.0 through
192.168.2.255 to the devices on a small local network.
The only connection between different subnets is via a router. If subnets are used, an IP
router must be employed.
IP router: Routers are the link between LANs. Using a router, a computer in a LAN can send
messages to any other networks, which might have other LANs behind them. If the
destination of the data is not within the LAN, the router forwards the data to another network
or group of networks where it can be delivered to its destination.
Routers rely on IP addresses to deliver and receive data packets.
S7-1200 Programmable controller
System Manual, 11/2011, A5E02486680-05
PROFINET port
98BDevice configuration
5.6 Configuring the CPU for communication
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