Digital Acoustics ESBx-110 Especificaciones descargar pdf (Pagina 385)

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IEEE 802.3 Ethernet Communication

ADDvantage-32 PLUS

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This format is used by Modbus TCP and Allen-Bradley’s Explicit and PCCC formats.

8.9.3 Network Addressing Concepts

The industry standard IP addressing definitions are as follows:

8.9.3.1 Class-based IP Addresses

The first bits of the IP address specify how the rest of the address should be separated into its

network and host part. The terms network address and netID are sometimes used instead of

network number, but the formal term, used in RFC 1166, “Internet Numbers” is network

number. Similarly, the terms host address and hostID are sometimes used instead of host

number. There are five classes of IP addresses. They are shown in Figure 8.9.3.1.

Figure 8.9.3.1 Sub-Net Classes

Where:

• Class A addresses: (1.x.x.x to 127.x.x.x), subnet mask 255.0.0.0

These addresses use 7 bits for the <network> and 24 bits for the <host> portion of the IP

address. This allows for 27-2 (126) networks each with 224-2 (16777214) hosts; a total of over

2 billion addresses.

• Loopback: The class A network 127.0.0.0 is defined as the loopback network. Addresses from

that network are assigned to interfaces that process data within the local system. These

loopback interfaces do not access a physical network.

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