Fins Communications Service Specifications For Ethernet - Omron CJ1W-ETN21 - 04-2009 Operation Manual

Overview of FINS Communications
6-1-3

FINS Communications Service Specifications for Ethernet

Item
Number of nodes
Message length
Number of buffers
Protocol name
Protocol used
Number of connections ---
Port number
Protection
Other
Internal table
• 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.
254
2,012 bytes max.
192
FINS/UDP method
UDP/IP
The selection of UDP/IP or TCP/IP is made by means of the FINS/TCP Tab in the CX-Pro-
grammer's Unit Setup.
9600 (default)
Can be changed.
No
Items set for each UDP
port
• Broadcast
• IP address conversion
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
Specifications
FINS/TCP method
TCP/IP
16
9600 (default)
Can be changed.
Yes (Specification of client IP addresses when Unit is used as a
server)
Items set for each connection
• Server/client specification
• Remote IP address specification
When client: Specify remote Ethernet Unit (server) IP address.
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
Section 6-1
117