Omron CS1W-ETN21 - Manual (Page 134)

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Private and Global Addresses Section 5-3
5-3-2 Using a Private Address for the Ethernet Unit
Conditions for Using
Communications
Applications When the Ethernet Unit has a private address, communications applications
can be used under the following conditions:
1,2,3... 1. FINS Communications Service
• FINS communications service is enabled only between Ethernet Units
with private addresses on the intranet.
A device such as a personal computer (with a FINS application including
a CX-Programmer) cannot connect online and communicate over the
Internet with an Ethernet Unit that has a private address. FINS communi-
cations over the Internet are also not possible between Ethernet Units
with private addresses.
• Either FINS/TCP or FINS/UDP can be used for the FINS communications
service.
• With FINS/UDP, all of the Ethernet Unit IP address conversion methods
can be used.
Intranet
Sending mail
Receiving mail
CX-Programmer, etc.
FINS/TCP client computer
Firewall
IP router
Ethernet
PLC
Communications in intranet
Ethernet Unit: Private address
FINS communications
FTP
Socket
Internet
Intranet
IP router
Firewall
Communications in Intranet
CX-Programmer, etc.
FINS/TCP client computer
Ethernet
PLC PLC
Communications
in Intranet
Ethernet Unit: Private address Ethernet Unit: Private address
FINS communications
FTP
Socket
E-mail can be sent and received
through the Internet.