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FINS/TCP Method
Section 8-3
8-3
FINS/TCP Method
8-3-1
Overview
FINS/TCP Features
The FINS/TCP method is a FINS communications method that uses the TCP/
IP protocol. TCP/IP is a connection-type communications protocol. Before a
message is sent from one node to another, it is necessary to establish a vir-
tual circuit, i.e., a connection. Once a connection has been established, com-
munications are quite reliable. The arrival of data that is sent via the
connection is confirmed by an acknowledgement (ACK) response, and retries
are executed automatically as required.
When FINS/TCP is used, it must be determined which node is the server and
which nodes are the clients.
For communications between a personal computer and a PLC, the computer
should normally be set as the client and the PLC as the server. For communi-
cations between two PLCs, either one can be set as the client and the other
as the server.
Compared to the FINS/UDP method, the FINS/TCP method has the following
characteristics.
• Data transmission is more reliable, due to factors such as retry process-
ing at the TCP/IP layer. The FINS/TCP method is thus better suited to
dealing with communications errors in an IP network that spans several
layers.
• Remote clients can be restricted by means of settings at the server (i.e.,
the server can be protected from access by non-specified IP addresses).
• Broadcasting cannot be used.
• TCP/IP has various retry procedures, and this tends to lower its perfor-
mance in comparison with UDP/IP.
• There is a limit to the number of connections that can be made (i.e., 16
connections maximum), and any given node can communicate only with
up to 16 other nodes at a time.
Node
(Client)
Data transmission 1
Request to establish a connection
Node
(Server)
Notification of establishing
connection
Acknowledgement
Acknowledgement
An acknowledgement is received whenever a
connection is established or data is sent, so
transmissions are more reliable but somewhat slower.
Connection
established
Summary of Contents for CJ2H-CPU6 - REV 02-2010
Page 2: ......
Page 4: ...iv...
Page 6: ...vi...
Page 14: ...xiv...
Page 18: ...xviii...
Page 38: ...12 Network Configurator Overview Section 1 5...
Page 58: ...32 Selecting the Network Devices Section 2 3...
Page 116: ...90 Auxiliary Area Data Section 4 5...
Page 222: ...196 Message Communications Errors Section 7 6...
Page 364: ...338 Using the Backup Tool Section 13 3...
Page 402: ...376 CS CJ series Ethernet Unit Function Comparison Appendix A...
Page 404: ...378 Ethernet Network Parameters Appendix B...
Page 406: ...380 TCP Status Transitions Appendix C...
Page 452: ...426 Precautions for Using Windows XP Vista or Windows 7 Appendix G...
Page 460: ...434 Index...
Page 462: ...436 Revision History...
Page 463: ......