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IP Addresses in FINS Communications Section 5-2
5-2-2 Pairing Addresses in Internal Tables
FINS/UDP Communications Methods
Automatic Generation
(Dynamic)
When the EtherNet/IP Unit or built-in EtherNet/IP port is turned ON or
restarted, the following values are set for addresses in the internal table.
• Remote IP address: Local IP address network number + remote
FINS node address
• Remote UDP port number: UDP port number set for local Unit
• Connection method: FINS/UDP
With the dynamic method, data in an internal table that has been generated
can be dynamically converted according to FINS messages received from
remote nodes. This is enabled when the remote node is a device such as a
personal computer and IP addresses are dynamically changed by a method
such as DHCP.
1 192.168.250.1 UDP 9600
2 UDP 9600
!
!
!
254 UDP 9600
192.168.250.2
192.168.250.254
FINS header
Remote FINS
node number
Remote IP
address (Example)
Connection
Remote port
number
(Example)
Internal table
FINS data
Application level
Transport level
Internet level
Physical level
FINS
UDP
TCP
IP
Ethernet
Node number
UDP port
number
TCP port
number
IP address
Ethernet address
Ethernet V2 IP UDP FINS header FINS data
Remote node
Application level
Transport level
Internet level
Physical level
FINS
UDP TCP
IP
Ethernet
Node number
UDP port
number
TCP port
number
IP address
Ethernet address
The remote node's IP address, UDP/TCP
method, UDP port number, and TCP port
number are calculated from the node
number in the FINS message, and an
Ethernet frame is generated.
Personal computer
Local FINS node number
Local IP address
Must be fixed.
Can be changed.
IP address
IP address
FINS command
FINS response
EtherNet/IP Unit
Change
registration
Internal table
Automatic generation
(dynamic setting)
Remote IP address
Local IP address
Ethernet (EtherNet/IP)
CPU Unit
Remote FINS node number
Local FINS node number
For the remote IP address,
a response is returned to
the changed IP address.