42
Manual – Controllers DHE/DHF/DHR21B (standard) and DHE/DHF/DHR41B (advanced)
4
Installing the DHR21B/41B option
Assembly and Installation Notes
4.9.5
TCP / IP addressing and subnets
Introduction
The settings for the address of the IP protocol are made using the following parameters:
•
MAC address
•
IP address
•
Subnet mask
•
Standard gateway
The addressing mechanisms and subdivision of the IP networks into subnets are
explained in this chapter to help you set the parameters correctly.
MAC address
The MAC address (Media Access Controller) is the basis for all address settings. The
MAC address is a worldwide unique 6-byte value (48 bits) assigned to the Ethernet
device. SEW Ethernet devices have the MAC address 00-0F-69-xx-xx-xx. The MAC
address is difficult to handle for large networks. This is why freely assignable IP
addresses are used.
IP address
The IP address is a 32-bit value that uniquely identifies a station in the network. An IP
address is represented by 4 decimal numbers separated by decimal points.
Example: 192.168.10.4
Each decimal number stands for one byte (= 8 bits) of the address and can also be
represented using binary code (see following table).
The IP address comprises a network address and a station address (see following
table).
The part of the IP address that denotes the network and the part that identifies the
station is determined by the network class and the subnet mask.
Station addresses cannot consist of only zeros or ones (binary) because they represent
the network itself or a broadcast address.
Network classes
The first byte of the IP address determines the network class and as such represents
the division into network addresses and station addresses.
This rough division is not sufficient for a number of networks. They also use an explicit,
adjustable subnet mask.
Byte 1
Byte 2
Byte 3
Byte 4
11000000
.
10101000
.
00001010
.
00000100
Network address
Station address
192.168.10
4
Value range
Network class
Complete network address
(Example)
Meaning
Byte 1
0 – 127
A
10.1.22.3
10 = Network address
1.22.3 = Station address
128 – 191
B
172.16.52.4
172.16 = Network address
52.4 = Station address
192 – 223
C
192.168.10.4
192.168.10 = Network address
4 = Station address
Buy: www.ValinOnline.com | Phone 844-385-3099 | Email: [email protected]