Omron SYSMAC CS1W-ETN21 Operation Manual page 128

IP Addresses in FINS Communications
FINS/TCP Communications Method
Pairing in the FINS/TCP
Method
Note
Internal Processing
1,2,3...
1,2,3...
With the FINS/TCP method, communications are first established for each
connection, and then remote FINS node addresses are mutually converted.
(See note.) Then FINS message communications are executed. In this way,
remote FINS node addresses and remote IP addresses are paired for each
connection. Therefore, with the FINS/TCP method, there is no need to set IP
address conversions (i.e., pairing FINS node addresses with IP addresses) as
with FINS/UDP. All that is required is to use the CX-Programmer's Unit setup
to set the remote IP address for each connection.
The internal table is changed after connections are established.
The Ethernet Unit executes the following processing when the FINS/TCP
method is used.
Local Device Is FINS/TCP Client
1. Connections are established in TCP/IP protocol with the IP addresses set
at the Unit (i.e., the IP address for each connection No.).
2. The remote node (i.e., the server) is notified of the FINS node address for
the local device.
3. Notification is received from the remote node (i.e., the server) of the re-
mote node's FINS node address.
4. The Ethernet Unit changes the internal table (FINS node address, IP ad-
dress, and TCP port number).
5. FINS messages can then be sent and received.
Local Device Is a FINS/TCP Server
1. A request to open a connection is received in TCP/IP protocol from the re-
mote device (i.e., the client, either a personal computer or an Ethernet
Unit), and the connection is established.
2. Notification is received from the remote node (i.e., the client) of the remote
node's FINS node address.
3. The local device provides notification of the local FINS node address.
4. The Ethernet Unit changes the internal node correspondence table (FINS
node address, IP address, and TCP port number).
5. FINS messages can then be sent and received.
Section 5-2
103