Omron CS Series Operation Manual page 126

IP Addresses in FINS Communications
Combined Method
100
Example
When FINS Command is Sent
FINS node number
FINS node
number
Node number in
IP address table
When FINS Command is Received
FINS node number
Node number not
in IP address table
Changed
The combined method combines the IP address table method and the auto-
matic generation method (dynamic).
First the IP address table is referenced. Then, if the applicable FINS node
address is found, the corresponding IP address is read. If the FINS node
address is not found, the IP address is calculated using the automatic genera-
tion method (dynamic).
The internal table will be as follows:
• FINS Node Address Registered to IP Address Table
The following address is registered to the internal table.
• Remote IP address:
• Remote UDP port number: UDP port number set for local Unit
• Connection method:
• FINS Node Address Not Registered to IP Address Table
The following address is registered to the internal table.
• Remote IP address:
• Remote UDP port number: UDP port number set for local Unit
• Connection method:
With the combined method, records of FINS nodes registered to the IP
address table are not dynamically changed. For all others nodes, the data
from FINS nodes registered with a remote IP address of 0.0.0.0 can be
dynamically changed when the Unit is turned ON or restarted, according to
FINS messages received from remote nodes. This can be used effectively
when the remote node is a device such as a personal computer and IP
addresses are dynamically changed by a method such as DHCP.
IP address table
IP address
18 153.214.0.62
20 153.214.0.129
23 153.218.51.8
Internal table
25 153.218.51.10
IP address registered to IP address table
FINS/UDP
Local IP address network number + FINS
node address
FINS/UDP
Section 5-2
IP address 153.214.0.129
FINS command sent
IP address 153.218.51.10
FINS response returned