SEW DHE41B, Руководство пользователя

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Manual – MOVI-PLC® advanced DHE41B/DHF41B/DHR41B Controller
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Installing the MOVI-PLC® advanced DHR41B controller
Mounting/Installation Instructions
4.5.5 TCP / IP addressing and subnetworks
Introduction The settings for the address of the IP protocol are made using the following parameters:
• MAC address
• IP address
• Subnetwork mask
• Standard gateway
The addressing mechanisms and subdivision of the IP networks into subnetworks 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 of an Ethernet device is a worldwide unique 6-byte value (48 bits). SEW
Ethernet devices have the MAC address 00-0F-69-xx-xx-xx. The MAC address is diffi-
cult to handle for larger 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 four 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 rep-
resented 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 sta-
tion is determined by the network class and the subnetwork 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