CJ1W-EIP21 Omron, CJ1W-EIP21 Datasheet - Page 122

• 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

5-1-5
5-2
5-2-1
Allocating Addresses to EtherNet/IP Units and Built-in EtherNet/IP Ports
FINS Message Reception
for EtherNet/IP Units or
Built-in EtherNet/IP Ports
94
IP Addresses in FINS Communications
IP Addresses in FINS Communications
CIDR
Specifying Nodes in FINS Communications Services
Note
CIDR, or classless interdomain routing, is used to assign IP addresses that do
not use classes. IP addresses that use classes are separated into blocks
according to net IDs and host IDs, resulting in inefficient usage of IP address
space.
CIDR does not use classes, so IP address space can be divided as required
to more efficiently use IP address space. For example, using a subnet mask
setting with CIDR enables building a horizontally distributed network exceed-
ing 254 nodes even if a class C address block (e.g., 192, 168...).
CIDR was added for unit version 2.0.
With FINS communications services on an Ethernet network, IP addresses,
UDP port numbers, and TCP port numbers are paired with FINS node
addresses to specify nodes on the network.
Use the Node Address Setting Switches (NODE NO.) on the front of the Eth-
erNet/IP Unit or, for the built-in EtherNet/IP port, on the front of the CPU Unit
to set the FINS node address.
The IP address, FINS/UDP port number, and FINS/TCP port number set for
the EtherNet/IP Unit or built-in EtherNet/IP port are mainly used when receiv-
ing FINS communications messages.
Application level
Transport level
Internet level
Physical level
192.0.0.0 to 255.255.255.252
Application level
Transport level
Internet level
Physical level
Subnet mask range
FINS
UDP
IP
Ethernet
FINS
UDP
IP
Ethernet
Ethernet V2
UDP port
number
UDP port
number
Ethernet address
Node number
IP address
Ethernet address
IP
Node number
IP address
TCP
UDP
TCP
TCP port
number
FINS header
TCP port
number
Receives communications data
conforming to Ethernet address,
IP address, UDP port number,
and FINS node number.
FINS data
Must be allocated.
Automatically allocated
Section 5-2