Omron CS1W-ETN21 - Manual (Page 136)

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Private and Global Addresses Section 5-3
5-3-3 Ethernet Unit with a Global Address
Conditions for Using
Communications
Applications Communications applications can be used over the Internet under the follow-
ing conditions:
1,2,3... 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.
Intranet
CX-Programmer, etc.
FINS/TCP client computer
Ethernet
Communications
over Internet Firewall
IP router
Internet Global address
(required)
Intranet
IP router
Firewall
Private address
Global address
Communications
in intranet
Ethernet
PLC
Ethernet Unit: Global address
Private address
Private address
Not output to Internet
Not output to Internet