CJ1W-EIP21 Omron, CJ1W-EIP21 Datasheet - Page 130

• 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

5-2-3
Responding to Computers with Changed IP Addresses
FINS/UDP
Communications Method
FINS/TCP
Communications Method
102
IP Addresses in FINS Communications
Application Examples
Note
2. Set IP addresses for the devices to be connected.
With FINS/UDP, whether using the automatic conversion method (dynamic),
the IP address table method, or the combined method, remote FINS node
addresses and remote IP addresses in the internal table are changed after
FINS messages are received. Therefore, even when a FINS command has
been received from a personal computer (a DHCP client computer) for which
the IP address is dynamically changed, a response can still be sent back to
the computer (the DHCP client computer) from which the command origi-
nated.
With FINS/TCP, FINS node addresses and IP addresses in the internal table
are changed with each connection that is established. Therefore, even when a
FINS command has been received from a personal computer (a DHCP client
computer) for which the IP address is dynamically changed, a response can
still be sent back to the computer (the DHCP client computer) from which the
command originated.
Automatic IP Address Setting by DHCP Service
DHCP service is a method whereby a DHCP server collectively manages all
of the IP address in a network.
Nodes that are functioning as clients acquire IP addresses from the DHCP
Set the IP address for the remote EtherNet/IP Unit or built-in EtherNet/IP
port (i.e., the server) connected by FINS/TCP.
This setting must be made if this EtherNet/IP Unit will be used as a FINS/
TCP client.
Personal computer (client)
Personal computer (client)
Response sent back to
changed IP address
Response sent back to
changed IP address
IP address
IP address
IP address changed
(acquired from DHCP server when connected)
IP address changed
(acquired from DHCP server when connected)
IP address
IP address
FINS command sent
FINS command sent
FINS response
FINS response
FINS command
FINS command
EtherNet/IP Unit
(FINS/TCP server; with
fixed IP address)
EtherNet/IP Unit
(with fixed IP address)
Ethernet (EtherNet/IP)
Ethernet (EtherNet/IP)
Section 5-2