Ethernet Unit With A Global Address - Omron CJ1W-ETN21 - 04-2009 Operation Manual

Private and Global Addresses
5-3-3

Ethernet Unit with a Global Address

Communications
over Internet
Intranet
Global address
IP router
Firewall
Communications
in intranet
Conditions for Using
Communications
Applications
1,2,3...
112
Intranet
Firewall
IP router
Internet
Private address
Ethernet
PLC
Ethernet Unit: Global address
Communications applications can be used over the Internet under the follow-
ing conditions:
1. FINS Communications Service
• A device such as a personal computer (with a FINS application including
a CX-Programmer) can connect online and communicate over the Inter-
net with an Ethernet Unit 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 Ethernet Unit's IP address
conversion method.
• The TCP port number to be used for FINS/TCP cannot be used if prohib-
ited by a firewall in the communications path.
2. Transferring Files
• Files can be transferred over the Internet between a device such as a per-
sonal computer (i.e., an FTP client) and a PLC with an Ethernet Unit that
has a global address.
• The TCP port number to be used for FTP cannot be used if prohibited by
a firewall in the communications path.
CX-Programmer, etc.
FINS/TCP client computer
Ethernet
Global address
(required)
Section 5-3
Private address
Not output to Internet
Not output to Internet
Private address