Omron NX102-12 Series User Manual

A-7
TCP State Transitions
There are 11 types of TCP connection state.
You can check the TCP state with the TCP connection status that is output by the SktGetTCPStatus
(Read TCP Socket Status) instruction.
The table below shows the TCP states and what each state means.
TCP state Definition
CLOSED The connection is closed.
LISTEN The server is waiting for a connection request (SYN) with a passive open.
SYN SENT The client sent a connection request (SYN) for an active open and is waiting for acknowl-
edgment (SYN + ACK).
SYN RECEIVED The server sent an acknowledgment (SYN + ACK) to a connection request (SYN) and is
waiting for acknowledgment (ACK).
ESTABLISHED A connection is established.
CLOSE WAIT The server sent acknowledgment (ACK) to a connection close request (FIN) and is wait-
ing for the server application to be ready to close.
FIN WAIT-1 The client sent a connection close request (FIN) and is waiting for acknowledgment
(ACK).
CLOSING The client and server simultaneously received a connection close request (FIN) and are
waiting for acknowledgment (ACK).
LAST-ACK The server sent a connection close request (FIN) and is waiting for acknowledgment
(ACK).
FIN WAIT-2 The client is waiting for a connection close request (FIN).
TIME WAIT The client received acknowledgment (ACK) to a connection close request (FIN) and is
waiting for it to be received and processed by the server
.
The TCP state changes as requests and acknowledgments are received from the remote node, and
as TCP socket connection and close instructions are executed in the user program.
When the state changes, a connection request (SYN), close request (FIN), and acknowledgment
(ACK) to those requests are sent to and received from the remote node.
The following figure shows TCP state transitions.
The TCP states are given in £ in the figure. Between states, the text in the upper row indicates the
condition for the state change, and the text in the lower row indicates the action that is performed at
the state change. (If no action is performed, none is given.)
Example: When SYN and ACK are received in SYN SENT
state, ACK is sent and the state changes to
ESTABLISHED.
Appendices
A-60
NJ/NX-series CPU Unit Built-in EtherNet/IP Port User’s Manual (W506)

Omron NX102-12 Series Specifications

General

Model	NX102-12 Series
Power Supply	24 VDC
Built-in EtherNet/IP port	Yes
Built-in EtherCAT port	Yes
SD Memory Card Slot	Yes
Communication Ports	USB
Programming Language	IEC 61131-3 (LD, FBD, ST, SFC)
Data Capacity	64 KB
Memory for Variables	64 KB
Operating Temperature	0°C to 55°C
Storage Temperature	-25°C to 75°C
Humidity	10% to 90%
Vibration Resistance	10 to 57 Hz, 0.075 mm amplitude, 57 to 150 Hz
Type	Programmable Logic Controller (PLC)
Number of I/O	12
I/O Points	12

Summary

Terms and Conditions Agreement

Warranty, Limitations of Liability

Details Omron's warranty, limitations, and buyer remedies for products.

Safety Precautions

Precautions for Safe Use

Lists manuals to refer to for safety precautions, covering safe usage of the product.

Precautions for Correct Use

Lists manuals to refer to for correct usage, covering proper operation and performance.

Section 1 Introduction

1-2 System Configuration and Configuration Devices

1-3 Built-in EtherNet/IP Port

Covers specifications and part names/functions of the built-in EtherNet/IP port.

1-4 Introduction to Communications Services

Section 2 Installing Ethernet Networks

2-1 Selecting the Network Devices

Recommends Ethernet switches and twisted-pair cables for EtherNet/IP use.

2-2 Network Installation

Section 3 System-defined Variables Related to the Built-in EtherNet/IP Port

3-1 System-defined Variables Related to the Built-in EtherNet/IP Port

Explains how to use system-defined variables to check the status of the built-in EtherNet/IP port.

3-2 System-defined Variables

Chapter 4 Determining IP Addresses

4-1 IP Addresses

Explains IP address configuration, allocation, subnet masks, and CIDR.

4-2 Built-in EtherNet/IP Port IP Address Settings

Details methods for setting IP addresses, including user-specified and BOOTP server options.

Chapter 5 Sysmac Studio Settings for the Built-in EtherNet/IP Port

5-1 TCP/IP Settings Display

Explains how to configure TCP/IP settings, including IP address and gateway.

5-4 NTP Settings Display

Chapter 6 Testing Communications

6-1 Testing Communications

Describes how to use the PING command to test communications with the built-in EtherNet/IP port.

Chapter 7 Tag Data Link Functions

7-1 Introduction to Tag Data Links

7-2 Setting Tag Data Links

Outlines the step-by-step procedure for setting tag data links, including network, tags, and connections.

7-3 Ladder Programming for Tag Data Links

Chapter 8 CIP Message Communications

8-1 Overview of the CIP Message Communications Service

8-2 CIP Message Communications Client Function

8-5 CIP Object Services

Chapter 9 Socket Service

9-1 Basic Knowledge on Socket Communications

9-2 Basic Knowledge on Protocols

9-4 Settings Required for the Socket Services

Lists the settings required in the Unit Setup to use socket services, such as IP address and subnet mask.

9-6 Details on Using the Socket Services

Chapter 10 Modbus TCP Master Function

10-1 Overview of Modbus TCP Master Function

10-3 Modbus TCP Master Function Procedure

Chapter 11 FTP Server

11-1 Overview and Specifications

11-3 Using the FTP Server Function

Outlines the procedure and required settings for using the FTP server function.

11-5 Using FTP Commands

Chapter 13 Automatic Clock Adjustment

13-1 Automatic Clock Adjustment

Explains how the built-in EtherNet/IP port reads clock information from an NTP server to update the internal clock.

13-2 Procedure to Use the Automatic Clock Adjustment Function

Outlines the steps to use the automatic clock adjustment function and required settings.

Chapter 14 SNMP Agent

14-1 SNMP Agent

14-2 Procedure to Use the SNMP Agent

Outlines the steps to use the SNMP agent and the required settings in Sysmac Studio.

Chapter 15 Communications Performance and Communications Load

15-1 Communications System

15-2 Adjusting the Communications Load

Explains how to adjust communications load by managing Ethernet switch functions and settings.

15-3 I/O Response Time in Tag Data Links

Chapter 16 Troubleshooting

16-1 Overview of Troubleshooting

Explains how to detect errors and find corrections for NJ/NX-series Controllers by managing errors as events.

16-2 Checking Status with the Network Configurator

Details how to check communication status and identify errors using the Network Configurator's Device Monitor function.

Appendix A Appendices

A-2 Use the Sysmac Studio to Set the Tag Data Links (EtherNet/IP Connections)

Guides users on setting up EtherNet/IP connections and tag data links using Sysmac Studio.

A-3 EDS File Management

A-4 Precautions for Using the Network Configurator on Windows XP, Windows Vista, or Windows 7 or Higher

A-5 Variable Memory Allocation Methods

A-8 Example of NX Unit Setting Using NX Configuration Object Service

A-7 TCP State Transitions

A-8 Example of NX Unit Setting Using NX Configuration Object Service

A-8-1 Changing the Unit Operation Settings for Singe NX Unit

A-8-2 Changing the Unit Operation Settings for Multiple NX Units