CJ1W-EIP21 Omron, CJ1W-EIP21 Datasheet - Page 126

• Manufacturer Part Number: CJ1W-EIP21
• Description: Ethernet I/P Module
• Manufacturer: Omron

Specifications of CJ1W-EIP21

• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Combined Method
98
IP Addresses in FINS Communications
Example
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:
With the combined method, records of FINS nodes registered to the IP
address table are not dynamically changed. When the Unit is turned ON or
restarted and the IP address of a remote FINS node is not registered in the IP
table, the IP address can be changed dynamically according to FINS mes-
sages received from the remote node. 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.
When FINS Command is Sent
When FINS Command is Received
FINS node number
FINS node number
• FINS Node Address Registered to IP Address Table
• FINS Node Address Not Registered to IP Address Table
The following address is registered to the internal table.
The following address is registered to the internal table.
Node number in
IP address table
Node number not
in IP address table
• Remote IP address:
• Remote UDP port number: UDP port number set for local Unit
• Connection method:
• Remote IP address:
• Remote UDP port number: UDP port number set for local Unit
• Connection method:
Changed
FINS node
number
18
20
23
25
IP address table
Internal table
153.214.0.129
153.218.51.10
153.214.0.62
153.218.51.8
IP address
IP address registered in IP address table
FINS/UDP
Local IP address network number + FINS
node address
FINS/UDP
IP address 153.214.0.129
FINS command sent
IP address 153.218.51.10
FINS response returned
Section 5-2