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shown in the diagram also applies if a CLOSE REQUEST command is exe-
cuted during OPEN REQUEST command execution, with the exception of the
status of the Opening Flag.

The following programming example illustrates transferring 100 bytes of data
between an Ethernet Unit and a host computer using TCP/IP communica-
tions.

The system configuration for the program example and the Ethernet Unit sys-
tem setup are shown below. To establish a TCP connection, the Ethernet Unit
is passively opened and the host computer actively opened. 

The data will flow between the CPU Unit, Ethernet Unit, and host computer as
shown in the following diagram.

Note Here, “execution bits” refer to CIO 000000 to CIO 000003, which are used in

the ladder diagram to control execution of communications and are not sys-
tem flags, such as the Port Enabled Flags (A20200 to A20207). 

• CIO 000000 is turned ON to request opening a passive TCP socket from

the Ethernet Unit.

• CIO 000001 is turned ON to request closing the TCP socket from the

Ethernet Unit.

• CIO 000002 is turned ON to request sending data from the Ethernet Unit.

Data (100 bytes) is sent beginning at D02005.

• CIO 000003 is turned ON to request receiving data from the Ethernet

Unit. The data that is received (100 bytes) is stored beginning at D04022.

Host computer

Ethernet Unit

IP address:      196.36.32.55
Port number:   4096

IP address: 

196.36.32.101

Port number: 

4096

FINS network address: 

01 Hex

Node address: 

01 Hex

Unit number: 

10 Hex

PC

CMND(490) response

Results stored in results 
storage area

Execution bits turned OFF

Host computer

Line 
(Ethernet)

Ethernet 
Unit

CPU Unit

Request Switches and 
execution bits turned ON 
(See note.)

Sent to line.

Processing in 
host computer