Omron CS1W-ETN21 operation manual Related Products and Communications/Setting Methods

IP Addresses in FINS Communications Section 5-2

applications, such as mail servers, are normally allocated fixed IP addresses. Ethernet Units in PLC systems are also allocated fixed IP addresses.

Simultaneously Running Multiple Applications on a Personal Computer

FINS/UDP Communications Method

In communications involving previous models, multiple communications appli- cations were configured on personal computers according to data accessing uses, and the fact that no more than one UDP port number for FINS commu- nications could be used on any given computer created a problem. This Ethernet Unit provides a practical solution with an internal table that pairs remote nodes (applications) with FINS node addresses, enabling dynamic changes.

FINS nodes are allocated individually for each application on the computer, and the respective FINS/UDP port numbers that are used are also allocated individually. When FINS/UDP FINS commands are sent from individual appli- cations to the Ethernet Unit, the respective remote IP addresses and remote port numbers in the internal table are dynamically changed.

FINS/TCP Communications Method

With this method as well, FINS nodes are allocated individually for each appli- cation on the computer, and the respective FINS/TCP port numbers that are used are also allocated individually. Each application is positioned with a FINS/TCP client, and requests the opening of a connection with the Ethernet Unit's FINS/TCP server. When the connection is established, the respective remote IP address and remote port number in the internal table are dynami- cally changed.

5-2-4 Related Products and Communications/Setting Methods

Models Supporting Automatic Generation Method (Dynamic)

Product		Model/Series/	Supports automatic
		Version	generation method
			(dynamic)?
CS-series Ethernet	100BASE-TX	CS1W-ETN21	Yes
Unit
	10BASE-5	CS1W-ETN01	No: Set by automatic
			generation method or
	10BASE-T	CS1W-ETN11
			combined method. Com-
			munications are not pos-
			sible with personal
			computers with variable
			IP addresses.
CJ-series Ethernet	100BASE-TX	CJ1W-ETN21	Yes
Unit
	10BASE-T	CJ1W-ETN11	No: Set by automatic
			generation method or
CV/CVM1-series	10BASE-5	CV500-ETN01
			combined method. Com-
Ethernet Unit
			munications are not pos-
FinsGateway		Version 4.xx or
			sible with personal
		lower
			computers with variable
			IP addresses.
		Version 2003 or	Yes
		higher
Programmable Terminal		NS Series	No: Set manually so that
			automatic settings can be
Open Network Controller (ONC)		---
			used with the automatic
			generation method.

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