Omron CS1W-ETN21 Automatic Generation Method Dynamic/Static, Example Number Example

IP Addresses in FINS Communications Section 5-2

Pairing IP Addresses with FINS Node Addresses at Local Nodes

Sending Ethernet Unit FINS Messages

A particular IP address is allocated to each communications node, including Ethernet Units. The IP address must be paired with the FINS node address (1 to 254) by one of the following methods.

Automatic Generation Method (Dynamic/Static)

Set the relation between the IP address and the FINS node address for the Ethernet Unit according to the following equation. If the setting does not con- form to this equation, a setting error will be generated and the ERH indicator will flash.

FINS node address = IP address host number

IP Address Table Method and Combined Method

With these methods, the IP address and the FINS node address for the Ether- net Unit have no particular relationship. Set both the FINS node address and the IP address so that they are not duplicated in the network.

When the Ethernet Unit sends a FINS message, it must determine the remote node's IP address, UDP port number, and TCP port number. The relation- ships between all addresses, such as remote FINS node addresses and IP addresses, are managed by an internal table at the Ethernet Unit.

Remote FINS node	Remote IP address	Connection	Remote port
address	(Example)		number (Example)
1	192.168.250.1	UDP	9600
2	192.168.250.2	UDP	9600
to
254	192.168.250.254	UDP	9600

When the Ethernet Unit is turned ON or restarted, the internal table is gener- ated automatically from the various settings that have been made. Depending on the setting method used, data such as remote IP addresses are changed dynamically. (Dynamic changes can be prohibited.)

FINS header FINS data

Internal table			Remote port
Remote FINS	Remote IP
node number	address (Example) Connection		number
			(Example)
1	192.168.250.1	UDP	9600
2	192.168.250.2	UDP	9600
!
!
!
254	192.168.250.254	UDP	9600
Application level		FINS			Node number
Transport level		UDP		UDP port		TCP port
				number	TCP	number
Internet level		IP			IP address
Physical level		Ethernet

Ethernet address

					Remote node
Application level	FINS			Node number
Transport level	UDP	UDP port				TCP	TCP port
		number					number
Internet level	IP
				IP address
Physical level	Ethernet
			Ethernet address

The remote node's IP address, UDP/TCP method, UDP port number, and TCP port number are calculated from the node number in the FINS message, and an Ethernet frame is generated.

Ethernet V2

IP

UDP

FINS header FINS data

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