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4 Determining IP Addresses
4-10
CJ-series EtherNet/IP Units Operation Manual for NJ-series CPU Unit (W495)
4-3
Private and Global Addresses
There are two kinds of IP addresses, private and global.
Generally, as shown below, global addresses in the intranet are allocated only to IP routers (such as
broadband routers) interfaced with the Internet. All other nodes in the intranet, which includes the Eth-
erNet/IP Unit, are allocated private addresses.
4-3-1
Private and Global Addresses
IP address
Description
Global address
These are IP addresses that connect directly to the Internet.
Allocated by application to NIC, each address is unique in
the world, and as many as 4.3 billion can be allocated world-
wide.
Private address
These are IP addresses for Intranet (LAN) use. Direct con-
nection to the Internet is not possible. Frames that include
private IP addresses are restricted by the router from being
sent outside the LAN.
●
Intranet
Personal computer
(e.g., Sysmac Studio)
Ethernet (EtherNet/IP)
Ethernet (EtherNet/IP)
Firewall
●
Internet
●
Intranet
Firewall
Controller
Controller
Controller
Private address
Personal computer
(e.g., Sysmac Studio)
Private address
Private address
Private address
Global address
IP router
Cannot connect to Internet
Cannot connect to Internet
Global address
Private address
Private address
IP router
(required)
Содержание SYSMAC CJ1W-EIP21
Страница 8: ...Manual Structure 6 CJ series EtherNet IP Units Operation Manual for NJ series CPU Unit W495...
Страница 10: ...Sections in this Manual 8 CJ series EtherNet IP Units Operation Manual for NJ series CPU Unit W495...
Страница 20: ...Read and Understand this Manual 18 CJ series EtherNet IP Units Operation Manual for NJ series CPU Unit W495...
Страница 42: ...Revision History 40 CJ series EtherNet IP Units Operation Manual for NJ series CPU Unit W495...
Страница 68: ...1 Introduction 1 26 CJ series EtherNet IP Units Operation Manual for NJ series CPU Unit W495...
Страница 80: ...2 Installing Ethernet Networks 2 12 CJ series EtherNet IP Units Operation Manual for NJ series CPU Unit W495...
Страница 130: ...6 Testing Communications 6 4 CJ series EtherNet IP Units Operation Manual for NJ series CPU Unit W495...
Страница 206: ...7 Tag Data Link Functions 7 76 CJ series EtherNet IP Units Operation Manual for NJ series CPU Unit W495...
Страница 246: ...8 Message Communications 8 40 CJ series EtherNet IP Units Operation Manual for NJ series CPU Unit W495...
Страница 266: ...9 FTP Server 9 20 CJ series EtherNet IP Units Operation Manual for NJ series CPU Unit W495...
Страница 374: ...13 Troubleshooting 13 56 CJ series EtherNet IP Units Operation Manual for NJ series CPU Unit W495...
Страница 431: ...Index 1 CJ series EtherNet IP Units Operation Manual for NJ series CPU Unit W495 I Index...
Страница 436: ...Index 6 CJ series EtherNet IP Units Operation Manual for NJ series CPU Unit W495 Index...
Страница 437: ......