Rockwell-automation 1738-AENTR, Series B POINT I/O and ArmorPOINT I/O Instrukcja Użytkownika Pobierz pdf (Strona 29)

Rockwell Automation Publication 1734-UM017B-EN-E - October 2013 21

Configure the Adapter with RSLogix5000 software Chapter 3

Gateway Address

This section applies to multi-network systems. If you have a single network

system, refer to the next section.

The Gateway Address is the default address of a network. It provides a single

domain name and point of entry to the site. Gateways connect individual physical

networks into a system of networks.

When a node needs to communicate with a node on another network, a gateway

transfers the data between the two networks. The figure shows gateway G

connecting Network 1 with Network 2.

When host B with IP address 128.2.0.1 communicates with host C, it knows

from C’s IP address that C is on the same network. in an Ethernet environment, B

can then resolve C’s IP address into a hardware address (MAC address) and

communicate with C directly.

When host B communicates with host A, it knows from A’s IP address that A is

on another network (the network IDs are different). In order to send data to A, B

must use the IP address of the gateway connecting the two networks. In this

example, the gateway’s IP address on Network 2 is 128.2.0.3.

The gateway has two IP addresses (128.1.0.2 and 128.2.0.3). The first must be

used by hosts on Network 1 and the second must be used by hosts on Network 2.

To be usable, a gateway of a host must be addressed using a network ID matching

its own.

Network 1

Network 2

128.1.0.1

128.2.0.1 128.2.0.2 128.2.0.3

128.1.0.2

1 2 ... 24 25 26 27 28 29 30 31 32 33 34 ... 119 120

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Rockwell-automation 1738-AENTR, Series B POINT I/O and ArmorPOINT I/O Instrukcja Użytkownika Strona 29