Overview Of Fins Communications; Communications On An Ethernet Network - Omron CS CJ1W-ETN21 Operation Manual

Overview of FINS Communications

7-1

Overview of FINS Communications

7-1-1

Communications On an Ethernet Network

160
Data is sent and received as UDP packets or UDP packets on an Ethernet
network.
PLC
Ethernet Unit
Ethernet
UDP packet (FINS response)
In the FINS communications service, both an IP address for IP (the Internet
layer) and a FINS node address for FINS (the application layer) are used for
the remote device. Also, 9600 is used as the default setting for the local UDP
or TCP port number (i.e., the transport layer) for identifying the application
layer, i.e., the FINS communications service. (Another number can be set for
the FINS/UDP port from the Setup Tab in the Unit Setup.)
For details on pairing FINS node addresses with IP addresses and UDP/TCP
port numbers, refer to the subsection IP Addresses in FINS Communications
under SECTION 5 Determining IP Addresses in the Operation Manual Con-
struction of Networks.
FINS
Application Layer
UDP
Transport Layer
IP
Internet Layer
Ethernet
Physical Layer
The FINS communications service is a communications method based on
UDP/IP, and it is supported by most OMRON Ethernet-related products. (In
this manual it is called the FINS/UDP method.) In addition to supporting the
FINS/UDP method, the CS1W-ETN21 and CJ1W-ETN21 support FINS com-
munications using TCP/IP. (In this manual, this is called the FINS/TCP
method.)
or host computer
UDP packet (FINS command)
Node Address
TCP
UDP Port No.
IP Address
Ethernet Address
Section 7-1
Ethernet Unit
PLC
TCP Port No.