Communication
8.4 Ethernet
S7-200 SMART
System Manual, V2.3, 07/2017, A5E03822230-AF
405
● Subnet mask: A subnet is a logical grouping of connected network devices. Nodes on a
subnet are usually located in close physical proximity to each other on a Local Area
Network (LAN). The subnet mask defines the boundaries of an IP subnet.
Note
A subnet mask of 255.255.255.0 is generally suitable for a local network.
● Default gateway IP address: Gateways (or IP routers) are the link between LANs. Using a
gateway, a computer in a LAN can send messages to other networks, which might have
other LANs behind them. If the data destination is not within the LAN, the gateway
forwards the data to another network or group of networks where it can be delivered to its
destination. Gateways rely on IP addresses to deliver and receive data packets.
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