Omron SYSMAC CS1W-ETN21 Operation Manual page 126

IP Addresses in FINS Communications
Note
Prohibiting Dynamically Changing Remote IP Addresses
Example
When FINS Command is Sent
FINS node number
IP address table
FINS node
number
Node number in
18
IP address table
20
23
Node number not
Network number: xx.xx.00.00
in IP address table
FINS node number: xx
Automatic
generation
method
When FINS Command is Received
FINS node number
Node number
Internal table
not in IP
address table
25
Changed
When an internal table IP address has been changed with the reception of a
FINS command, this is sent to the IP address in the internal table.
For Ethernet Units with Unit Ver. 1.3 or later, methods used to dynamically
change remote IP addresses (automatic generation, IP address table, or com-
bined (mixed) method) can be prohibited (protected against). Use the CX-Pro-
grammer unit setting function (version 5.0 and higher) or Web function setting
window to make this setting.
When dynamically changing remote (destination) IP addresses is prohibited,
the internal table for each method is maintained in the state when the power
was turned ON or restarted. Therefore, protection can be provided against
access using FINS/UDP from personal computers or other devices that have
dynamically changing IP addresses. To prohibit (protect from) dynamic
changes, deselect the Change Dynamically option in the Setup Tab of the Unit
Setup.
IP address
153.214.0.62
153.214.0.129 IP address
FINS command
153.218.51.8
sent
+
IP address
(See note.)
FINS command
sent
153.218.51.10
IP address
153.218.51.10
FINS response
returned
Section 5-2
IP address
method
Automatic
generation
method
(dynamic)
101