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4 : // Request to close the

socket

SktClose_instance(

Execute :=TRUE,

Socket :=WkSocket); // Socket

IF (SktClose_instance.Done=TRUE) THEN

Stage :=INT#0; // Normal end

ELSIF (SktClose_instance.Error=TRUE) THEN

Stage :=INT#40; // Error end

END_IF;

0 : // Normal end

DoSendAndRcv :=FALSE;

Trigger :=FALSE;

ELSE // Interrupted by error.

DoSendAndRcv :=FALSE;

Trigger :=FALSE;

END_CASE;

END_IF;

9-6-5

TCP Sample Programming

In this sample, the TCP socket service is used for data communications between the NJ/NX-series

Controller and a remote node.

In this example, programming is also required in the remote node. The order of sending and receiving

is reversed in comparison with the above procedure.

IP address: 192.168.250.1

TCP port number: Automatically assigned.

Ethernet line

Built-in EtherNet/IP Port

Data received.

Remote node

IP address: 192.168.250.2

TCP port number: 6000

Data sent.

Local Node Programming

The processing procedure at the local node is as follows:

1 The SktTCPConnect instruction is used to make a request for connection to the TCP port on

the remote node.

2 The SktClearBuf instruction is used to clear the receive buffer of a TCP socket.

9 Socket Service

9-22

NJ/NX-series CPU Unit Built-in EtherNet/IP Port User’s Manual (W506)

Omron NX102-12 Series User Manual

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