SEW-Eurodrive ECDriveS, Руководство пользователя, Страница: 14 / 56

3
Assembly and installation notes
TCP/IP addressing and subnetworks
Manual – ECDriveS
®
14
This rough division is not sufficient for a number of networks. The networks also use
an explicit, adjustable subnet mask.
3.4.4 Subnetwork mask
A subnet mask is used to divide the network classes into even finer sections. Like the
IP address, the subnet mask is represented by 4 decimal numbers separated by
decimal points.
Each decimal number stands for 1 byte (8 bits) of the subnet mask and can also be
represented using binary code:
Exemplary subnet mask: 255.255.255.128
Byte Decimal Binary
1 255 11111111
2 255 11111111
3 255 11111111
4 128 10000000
The binary representation of the IP address and the subnet mask shows that in the
subnet mask, all bits of the network address are set to 1 and only the bits of the node
addresses have the value 0:
IP address: 192.168.10.129 Subnet mask: 255.255.255.128
Bytes 1 – 4 Bytes 1 – 4
Network address
11000000 11111111
10101000 11111111
00001010 11111111
Node address 10000001 10000000
The class C network with the network address 192.168.10 is further subdivided into
the following 2 networks by the subnet mask 255.255.255.128:
Network address Node addresses
192.168.10.0 192.168.10.1 – 192.168.10.126
192.168.10.128 192.168.10.129 – 192.168.10.254
The network nodes use a logical AND operation for the IP address and the subnet
mask to determine whether there is a communication partner in the same network or
in a different network. If the communication partner is in a different network, the stand-
ard gateway is addressed for passing on the data.
3.4.5 Standard gateway
The standard gateway is also addressed via a 32-bit address. The 32-bit address is
represented by 4 decimal numbers separated by decimal points.
Exemplary standard gateway: 192.168.10.1
25938274/EN – 01/2019