Ip Addresses In Fins Communications; Cidr; Specifying Nodes In Fins Communications Services - Omron SYSMAC CJ1W-EIP21 Operation Manual

IP Addresses in FINS Communications

5-1-5

CIDR

5-2

IP Addresses in FINS Communications

5-2-1

Specifying Nodes in FINS Communications Services

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
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...).
Subnet mask range
192.0.0.0 to 255.255.255.252
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.
Application level
Transport level
Internet level
Physical level
Note 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
FINS
Node number
UDP TCP
UDP port
number
IP
IP address
Ethernet
Ethernet address
FINS
Node number
UDP TCP
UDP port TCP port
number number
IP
IP address
Ethernet
Ethernet address
IP UDP
Ethernet V2
Section 5-2
TCP port
number
Must be allocated.
Automatically allocated
Receives communications data
conforming to Ethernet address,
IP address, UDP port number,
and FINS node number.
FINS data
FINS header