FANUC Robotics America GFK-1541B ユーザーズマニュアル

Gateways (also known as routers) connect individual physical networks into a system of
networks.  When a node needs to communicate with a node on another physical network, a
gateway transfers the data between the two networks.

The following example shows Gateway G connecting Network 1 with Network 2.

172.16.0.1

172.17.0.1

172.17.0.2

172.17.0.3

172.16.0.2

When host B with IP address 172.17.0.1 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 to a
MAC address (via ARP) 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 netids are different).  In order to send data to A, B must have the IP address of the
gateway connecting the two networks.  In this example, the gateway’s IP address on Network 2 is
172.17.0.3.  This address would be configured in the Ethernet Interface’s module configuration
for PLC B as its default gateway address.

Note that the gateway has two IP addresses (172.16.0.2 and 172.17.0.3).  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
host’s gateway must be addressed using an IP address with a netid matching its own.

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