Omron CS1W-ETN21 operation manual Ethernet Unit with a Global Address

Private and Global Addresses Section 5-3

5-3-3 Ethernet Unit with a Global Address

Communications over Internet

Intranet

IP router

Intranet

CX-Programmer, etc.

FINS/TCP client computer

Ethernet

Firewall

IP router

Internet	Global address
	(required)

Global address

Private address

Private address

Not output to Internet

Not output to Internet

Private address

Firewall

Ethernet

Communications in intranet

PLC

Ethernet Unit: Global address

Conditions for Using Communications Applications

1,2,3...

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.

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