Omron CP1L-EL20DR-D, Operation Manual

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FINS Communications Section 6-5
6-5 FINS Communications
6-5-1 FINS Communications Service Specifications
Note (1) Refer to the following diagram for the relation between message length
and date length.
(2) The FINS/UDP and FINS/TCP port numbers for CX-Programmer Auto
Connection are always set to 9600, although the FINS/UDP and FINS/
TCP port numbers for user are set to other values.
Item Specification
Number of nodes 254
Message Length 1016 bytes max.
Date Length (See note 1.) 1004 bytes max.
Number of buffer 16
Protocol name FINS/UDP method FINS/TCP method
Protocol used UDP/IP TCP/IP
The selection of UDP/IP or TCP/IP is made by means of the FINS/UDP or FINS/TCP but-
ton in Built-in Ethernet Tab in the CX-Programmer's PLC Setup.
Number of connections --- 3 for user, 1 for CX-Programmer auto connection
Port number (See note 2.) 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
• Address conversion method
Items set for each connection
• Server/client specification
• Remote IP address specification
Server: Specify IP addresses of clients permitted to
connect.
Client: Specify remote Ethernet Unit (server) IP
address.
• 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.
Internal table This is 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 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
10 bytes 2 bytes
Date length Command code
1004 bytes max.
FINS header
Message length: 1016 bytes max.