Configuring Hardware and Communication Connections STEP 7.pdf

IP Address
Networking Stations
The IP parameters are only visible if the Ethernet CP supports the TCP/IP protocol.
The IP address consists of 4 decimal numbers, value range from 0 to 255. The
decimal numbers are separated by a dot.
The IP address consists of
• The (sub)net address
• The partner address (generally referred to as host or network node)
The subnet mask separates those two addresses. It determines the IP address
sections used to address the network and the node IP.
The set bits of the subnet mask determine the network component of the IP
address.
In the example above:
Subnet mask: 255.255.0.0 = 11111111.11111111.00000000.00000000
Meaning: the first 2 bytes of the IP address determine the subnet - that is, 140.80.
The last two bytes address the node - that is, 2.
Generally valid is:
• The network address is the result of the logic operation IP address AND subnet
mask.
• The node address is the result of the logic operation IP address AND NOT
subnet mask.
Configuring Hardware and Communication Connections with STEP 7
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