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FINS/TCP Method Section 7-4
• When routing tables are used for one or more other nodes on the same
network.
It is not necessary to set routing tables if one Communications Unit is
mounted to the PLC and the nodes are connected as one network.
For details on setting routing tables, refer to the section on creating routing
tables in Section 6 FINS Communications in the Operation Manual, Construc-
tion of Networks.
7-4-2 FINS/TCP Mode Specifications
FINS/TCP Headers
FINS NODE ADDRESS
DATA SEND (CLIENT TO
SERVER) Command
When this command is executed, the client node stores its own FINS node
address in the client node address and notifies the server. This command is
sent after the TCP connection is established (ESTABLISH).
When specifying automatically allocated FINS node addresses, specify
00000000 hexadecimal for the client node address.
After a connection has been established as a FINS/TCP client or server, do
not send this command again. Otherwise, the error code (00000003 hexadec-
imal: The command is not supported) will be received in the FINS FRAME
SEND ERROR NOTIFICATION command and the connection will be termi-
nated.
The details of the above frame are shown in the following table.
FINS NODE ADDRESS
DATA SEND (SERVER TO
CLIENT) Command
When this command is executed, the server node notifies the client of its own
FINS node address. This command is sent after the server has received the
FINS NODE ADDRESS DATA SEND (CLIENT TO SERVER) command. The
FINS NODE ADDRESS DATA SEND (CLIENT TO SERVER) command
received by the server is decoded and if any errors are detected, the error
details are sent by adding to the Error Code in the command, and then the
connection is closed.
When this command is received by the client node, the TCP/IP port must be
closed quickly, unless the contents of the Error Code are 00000000 hexadeci-
mal (normal).
Item Contents (hexadecimal) Remarks
Header 46494E53 ASCII code: ‘FINS’
Length 0000000C 12 bytes: Length of data from
command onwards.
Command 00000000
Error code 00000000 Not used, so does not require
checking by server.
Client node address
(FINS node address
of FINS/TCP client)
00000000 to 000000FE 0 to 254
Note: Client FINS node
addresses are automatically
obtained when set to 0.
Size
(bytes)
FINS/TCP header
Header
Lengt
h
Command
Error code
Client node address
4
4
4
4
4