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108
Private and Global Addresses Section 5-3
Communications Services
That Require Global
Addresses for Ethernet
Units
A global address is required for the Ethernet Unit's IP address when the fol-
lowing communications services are used over the Internet.
• FINS communications services
• File transfers
• Socket services
When mail is sent or received over the Internet, the Unit's IP address can be a
private address.
Intranet
Personal computer,
CX-Programmer, etc.
Ethernet
PLC
Firewall
IP router
Private address
Internet
Global address
(required)
Intranet
Private address
IP router
Global address
Private address
Firewall
Ethernet
PLC PLC
Private address Private address
Not output to Internet
Personal computer,
CX-Programmer, etc.
Not output to Internet
Private address