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Overview of FINS Communications
Section 8-1
8-1-2
Using the FINS/UDP and FINS/TCP Methods
It is recommended that FINS/UDP and FINS/TCP be used as follows:
• When remote devices do not support the FINS/TCP method:
Use the FINS/UDP method for FINS communications with those devices.
• When FINS nodes are connected on the same Ethernet segment:
Use the FINS/UDP method between those nodes.
Note
FINS/UDP offers a slight advantage in performance.
• When FINS nodes are connected over multiple IP network layers:
Use the FINS/TCP method between those nodes.
Note
FINS/TCP offers superior communications quality.
• When the quality of connections is unreliable, as with wireless LAN:
Use the FINS/TCP method between those nodes.
Note
FINS/TCP offers superior communications quality.
8-1-3
FINS Communications Service Specifications
Item
Specifications
Number of nodes
254
Message length
2,012 bytes max.
Number of buffers
192
Protocol name
FINS/UDP method
FINS/TCP method
Protocol used
UDP/IP
TCP/IP
Number of connections ---
16
Port number
9600 (default)
Can be changed.
9600 (default)
Can be changed.
Protection
No
Yes (Specification of client IP addresses when Unit is used as a
server)
Other
Items set for each UDP
port
• Broadcast
• IP Address Conversion
Items set for each connection
• Server/client specification
• Remote IP address specification
When client: Specify the IP address of the remote Unit (server).
When server: Specify IP addresses of clients permitted to con-
nect.
• Automatic FINS node address allocation:
Specify automatic allocation of client FINS node addresses.
• Keep-alive:
Specify whether remote node keep-alive is to be used.
TCP/IP Setting
• Remote node keep-alive time
Internal table
This a table of correspondences for remote FINS node addresses, remote IP addresses, TCP/
UDP, and remote port numbers. It is created automatically when power is turned ON to the
PLC or when the Ethernet Unit is restarted, and it is automatically changed when a connection
is established by means of the FINS/TCP method or when a FINS command received.
The following functions are enabled by using this table.
• IP address conversion using the FINS/UDP method
• Automatic FINS node address conversion after a connection is established using the FINS/
TCP method
• Automatic client FINS node address allocation using the FINS/TCP method
• Simultaneous connection of multiple FINS applications
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: ......