4-3-3
Using a Global Address for the Built-in EtherNet/IP Port
Communications
over Internet
Intranet
Global address
IP router
Private address
Firewall
Communications
in intranet
Conditions for Communications Applications
You can use the explicit message communications service over the Internet under the following con-
ditions.
• A device such as a personal computer (a CIP application including the Network Configurator) can
connect online and communicate over the Internet with a built-in EtherNet/IP port that has a global
address.
• The TCP port number (44818) or UDP port number (44818) that is used for EtherNet/IP cannot be
used because it is prohibited by a firewall in the communications path.
Precautions for Correct Use
Precautions for Correct Use
Network Security and Firewalls
To set a global IP address for a built-in EtherNet/IP port involves network security consider-
ations. It is recommended that the user contract with a communications company for a dedicated
line, rather than for a general line such as a broadband line. Also, be sure to consult with a net-
work specialist and consider security measures such as a firewall. After a firewall has been set
up by a communications technician, there may be some applications that cannot be used. Be
sure to check first with the communications technician.
NJ/NX-series CPU Unit Built-in EtherNet/IP Port User's Manual (W506)
Intranet
CIP client on a computer,
such as Network
Configurator
Ethernet (EtherNet/IP)
Firewall
IP router
Internet
Global address
Ethernet (EtherNet/IP)
Controller
Built-in EtherNet/IP port: Global address
4 Determining IP Addresses
Private address
Cannot connect to Internet
(required)
Cannot connect to Internet
Private address
4
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