Omron CJ1W-EIP21 User Manual

Communications applications can be used over the Internet under the follow-
ing conditions:

■

• A device such as a personal computer (a FINS application, including the

CX-Programmer) can connect online and communicate over the Internet
with an EtherNet/IP Unit or built-in EtherNet/IP port that has a global
address.

• FINS/TCP is recommended as the FINS communications service

method.
FINS/TCP is more reliable than FINS/UDP in terms of communications
errors involving IP routers.

• The IP address table method is used as the IP address conversion

method of the EtherNet/IP Unit or built-in EtherNet/IP port.

• The TCP port number to be used for FINS/TCP cannot be used if prohib-

ited by a firewall in the communications path.

■

• A device such as a personal computer (a CIP application including the

Network Configurator) can connect online and communicate over the
Internet with an EtherNet/IP Unit or built-in EtherNet/IP port that has a
global address.

Intranet

FINS/TCP client computer 
with CX-Programmer, etc.
or
CIP client computer with 
Network Configurator, etc.

Ethernet (EtherNet/IP)

Communications 
over Internet

Firewall

IP router

Internet

Global address 
(required)

Intranet

IP router

Firewall

Private address

Global address

Communications 
in intranet

Ethernet (EtherNet/IP)

PLC

EtherNet/IP Unit: Global address

Private address

Private address

Not output to Internet

Not output to Internet