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Overview of FINS Communications | Section |
7-1-2 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.
FINS Communications Service Specifications for Ethernet | |||
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Number of nodes | 254 |
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Message length | 2,012 bytes max. |
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Number of buffers | 192 |
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Protocol name | FINS/UDP method | FINS/TCP method | |
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Protocol used | UDP/IP | TCP/IP | |
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| The selection of UDP/IP or TCP/IP is made by means of the FINS/TCP Tab in the | |
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| grammer's Unit Setup. |
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Number of connections | 16 | ||
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Port number | 9600 (default) | 9600 (default) | |
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| Can be changed. | Can be changed. |
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Protection | No | Yes (Specification of client IP addresses when Unit is used as a | |
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| server) |
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Other |
| Items set for each UDP | Items set for each connection |
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| port | • Server/client specification |
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| • Broadcast | |
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| • Remote IP address specification | |
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| • Address conversion | When client: Specify remote Ethernet Unit (server) IP address |
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| method | |
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| When server: Specify IP addresses of clients permitted to con- | |
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| nect |
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| • Automatic FINS node address allocation: |
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| Specify automatic allocation of client FINS node addresses |
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| Specify whether remote node |
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| TCP/IP Setting: |
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| • Remote node |
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Internal table | This a table of correspondences for remote FINS node addresses, remote IP addresses, TCP/ | ||
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| UDP, and remote port numbers. It is created automatically when power is turned ON to the | |
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| PLC or when the Ethernet Unit is restarted, and it is automatically changed when a connection | |
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| is established by means of the FINS/TCP method or when a FINS command received. | |
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| The following functions are enabled by using this table. | |
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| • IP address conversion using the FINS/UDP method | |
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| • Automatic FINS node address conversion after a connection is established using the FINS/ | |
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| TCP method |
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| • Automatic client FINS node address allocation using the FINS/TCP method | |
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| • Simultaneous connection of multiple FINS applications | |
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