Private And Global Addresses; Pairing Ip Addresses And Fins Node Addresses - Omron CJ1W-ETN21 - 04-2009 Operation Manual

Private and Global Addresses

5-2-5

Pairing IP Addresses and FINS Node Addresses

Communi- Method of pairing
cations of IP addresses
method and FINS node
addresses
FINS/UDP By pairing FINS
node addresses with
IP addresses in
Ethernet
FINS/TCP By automatic conver-
sion of FINS node
addresses at Ether-
net Unit and remote
node (and then
sending and receiv-
ing data)
5-3

Private and Global Addresses

5-3-1

Private and Global Addresses

108
Product
Programmable Terminal
Open Network Controller (ONC)
The following table shows the methods for pairing IP address and FINS node
addresses, and the relation between fixed and variable address, for both
FINS/UDP and FINS/TCP.
IP address determination
IP address Automatic gen-
conversion eration method
(static)
Automatic gen-
eration method
(dynamic)
IP address table
method
Combined
method
Automatic Connection
method (auto-
matic FINS
node address
conversion)
There are two kinds of IP addresses, private and global.
• Global addresses: These are IP addresses that connect directly to the
Internet. Allocated by application to NIC, each
address is unique in the world, and as many as 4.3
million can be allocated worldwide.
• Private addresses: These are IP addresses for Intranet (LAN) use, and
cannot connect directly to the Internet. Frames that
include private IP addresses are restricted by the
router from being sent outside the LAN.
Generally, as shown below, global addresses in the intranet are allocated only
to IP routers (such as broadband routers) interfacing with the Internet. All
other nodes in the intranet, including the Ethernet Unit, are allocated private
addresses.
Model/Series/
Version
NS Series
---
Client (personal
computer of PLC)
FINS node IP address FINS node
address
Fixed Fixed
Fixed Fixed or
variable
Fixed Fixed or
variable
Fixed Fixed or
variable
Fixed or Fixed or
can be allo- variable
cated auto-
matically
when not
determined.
Section 5-3
Supports combined
method?
No: Set manually. FINS
communications are not
possible with personal
computers set automati-
cally by DHCP.
Server (PLC)
IP address
address
Fixed Fixed
Fixed Fixed
Fixed Fixed
Fixed Fixed
Fixed Fixed