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IP Addresses in FINS Communications Section 5-2
server whenever the system is started. Therefore, at a personal computer
using the DHCP service, IP addresses may be different with each system
startup.
DHCP service is mainly used for automatic settings in devices such as per-
sonal computers that are used for client applications. Nodes used for server
applications, such as mail servers, are normally allocated fixed IP addresses.
EtherNet/IP Units and built-in EtherNet/IP ports in PLC systems are also allo-
cated fixed IP addresses.
Simultaneously Running Multiple Applications on a Personal Computer
In communications involving previous models, multiple communications appli-
cations were configured on personal computers according to data accessing
uses, and the fact that no more than one UDP port number for FINS commu-
nications could be used on any given computer created a problem. This Eth-
erNet/IP Unit provides a practical solution with an internal table that pairs
remote nodes (applications) with FINS node addresses, enabling dynamic
changes.
FINS/UDP
Communications Method
FINS nodes are allocated individually for each application on the computer,
and the respective FINS/UDP port numbers that are used are also allocated
individually. When FINS/UDP FINS commands are sent from individual appli-
cations to the EtherNet/IP Unit or built-in EtherNet/IP port, the respective
remote IP addresses and remote port numbers in the internal table are
dynamically changed.
FINS/TCP
Communications Method
With this method as well, FINS nodes are allocated individually for each appli-
cation on the computer, and the respective FINS/TCP port numbers that are
used are also allocated individually. Each application is positioned with a
FINS/TCP client, and requests the opening of a connection with the FINS/
TCP server of the EtherNet/IP Unit or built-in EtherNet/IP port. When the
connection is established, the respective remote IP address and remote port
number in the internal table are dynamically changed.
5-2-4 Related Products and Communications/Setting Methods
Models Supporting
Automatic Generation
Method (Dynamic)
Product Model/Series/
Version
Supports automatic
generation method
(dynamic)?
CS-series Ethernet
Unit
100BASE-TX CS1W-ETN21 Yes
10BASE-5 CS1W-ETN01 No: Set by automatic
generation method or
combined method. Com-
munications are not pos-
sible with personal
computers with variable
IP addresses.
10BASE-T CS1W-ETN11
CJ-series Ethernet
Unit
100BASE-TX CJ1W-ETN21 Yes
10BASE-T CJ1W-ETN11 No: Set by automatic
generation method or
combined method. Com-
munications are not pos-
sible with personal
computers with variable
IP addresses.
CV/CVM1-series
Ethernet Unit
10BASE-5 CV500-ETN01
FinsGateway Version 4.xx or
lower
Version 2003 or
higher
Ye s