Rockwell Automation 1756-NEX User Manual

NeXUS Module

1756-CLX/C

User Manual

Important User Information

Because of the variety of uses for the products described in this publication, those
responsible for the application and use of these products must satisfy themselves that all
necessary steps have been taken to assure that each application and use meets all
performance and safety requirements, including any applicable laws, regulations, codes
and standards. In no event will Allen-Bradley be responsible or liable for indirect or
consequential damage resulting from the use or application of these products.

Any illustrations, charts, sample programs, and layout examples shown in this publication
are intended solely for purposes of example. Since there are many variables and
requirements associated with any particular installation, Allen-Bradley does not assume
responsibility or liability (to include intellectual property liability) for actual use based
upon the examples shown in this publication.

Allen-Bradley publication SGI-1.1, Safety Guidelines for the Application, Installation and
Maintenance of Solid-State Control (available from your local Allen-Bradley office),
describes some important differences between solid-state equipment and
electromechanical devices that should be taken into consideration when applying products
such as those described in this publication.

Reproduction of the contents of this copyrighted publication, in whole or part, without
written permission of Rockwell Automation, is prohibited.

Throughout this publication, notes may be used to make you aware of safety
considerations. The following annotations and their accompanying statements help you to
identify a potential hazard, avoid a potential hazard, and recognize the consequences of a
potential hazard:

ATTENTION

IMPORTANT

Identifies information about practices or circumstances that can
lead to personal injury or death, property damage, or economic
loss.

Identifies information that is critical for successful application
and understanding of the product.

ATTENTION

Environment and Enclosure

This equipment is intended for use in a Pollution Degree 2 industrial
environment, in overvoltage Category II applications (as defined in
IEC publication 60664-1), at altitudes up to 2000 meters without
derating.

This equipment is supplied as "open type" equipment. It must be
mounted within an enclosure that is suitably designed for those specific
environmental conditions that will be present and appropriately
designed to prevent personal injury resulting from accessibility to live
parts. The interior of the enclosure must be accessible only by the use
of a tool. Subsequent sections of this publication may contain
additional information regarding specific enclosure type ratings that
are required to comply with certain product safety certifications.

See NEMA Standards publication 250 and IEC publication 60529, as
applicable, for explanations of the degrees of protection provided by
different types of enclosure. Also, see the appropriate sections in this
publication, as well as the Allen-Bradley publication 1770-4.1
("Industrial Automation Wiring and Grounding Guidelines"), for
additional installation requirements pertaining to this equipment.

Rockwell Automation Support

Rockwell Automation offers support services worldwide, with over 75 sales/support
offices, 512 authorized distributors and 260 authorized systems integrators located
throughout the United States alone, as well as Rockwell Automation representatives in
every major country in the world.

IMPORTANT

The 1756-CLX/C module is supported only by Rockwell Automation
Japan. Refer to Technical Product Assistance on page 4 for contact
information.

Product Support

Contact your Rockwell Automation representative for:

• sales and order support

• product technical training

• warranty support

• support service agreements

Technical Product Assistance

If you need to contact Rockwell Automation for technical assistance, please review the
troubleshooting information first. If the problem persists, contact a Rockwell Automation
representative at the following location:

Rockwell Automation Japan Co., Ltd.
Tokyo Headquarters
Shinkawa Sanko Building
8F/9F, 1-3-17, Shinkawa,
Chuo-ku, Tokyo 104-0033
Tokyo
Japan

Telephone: [phone]

Fax: [phone]

Preface

What This Preface Contains

This preface describes how to use this manual. The following table describes what this
preface contains and where to find it.

For information about this topic: See page:

Who Should Use This Manual P-1

Purpose of This Manual P-1

What This Manual Contains P-2

Common Techniques Used in This Manual P-3

Related Documentation P-3

Who Should Use This Manual

You must be able to program and operate an Allen-Bradley ControlLogix™ Logix
controller and ControlLogix I/O modules to efficiently use your 1756-CLX/C module.

We assume that you know how to do this in this manual. If you do not, refer to the list of
Related Documentation on page P-3 of this preface before you attempt to use this module.

Purpose of This Manual

This manual describes how to install, configure, and troubleshoot your 1756-CLX/C
module.

Publication 1756-UM524B-EN-P - December 2008

P-2 Preface

s

What This Manual Contains

This user manual contains the following sections:

Chapter 1 - About the 1756-CLX/C Module
Description of the 1756-CLX/C module

Chapter 3 - About the NeXUS Network
Overview of the NeXUS network and functions
supported by the 1756-CLX/C module

Chapter 5 - Status Indicators and
Troubleshooting
Description of how to troubleshoot the
1756-CLX/C module

Chapter 2 - Install the 1756-CLX/C Module
Description of how to install the 1756-CLX/C
module and connect the Ethernet cable

Chapter 4 - Configure the 1756-CLX/C Module
Description of how to configure the 1756-CLX/C
module with RSLogix 5000

Appendix A - Specifications
Listing of the 1756-CLX/C module specifications

Appendix B - Appendix B - Factory-set Jumpers
Description of all factory-set jumper positions

Appendix C - 1756-CLX/C Web Interface
Describes how to access and use web-based
information about the 1756-CLX/C module

Appendix D - 1756-CLX/C Module Backplane
Communication Tag List
Complete list of backplane (API) communication tag

Appendix E - 1756-CLX/C Module Tag List
Complete list of the input and output data tags

Glossary - Definitions of terms used in this manual

Publication 1756-UM524B-EN-P - December 2008

Common Techniques Used in This Manual

The following conventions are used throughout this manual:

• Bulleted lists provide information, not procedural steps

• Numbered lists provide sequential steps

• Screen captures are pictures of the software’s actual screens

• The names of screen buttons and fields are often in bold in

the text of a procedure

Preface P-3

TIP

This symbol identifies helpful information.

Related Documentation

The following table lists related ControlLogix documentation:

Table A Related Documentation

Catalog number: Document title: Pub. number:

1756-A4, -A7, -A10,

-A13, -A17

1756-PA72, -PB72 ControlLogix Power Supply Installation Instructions 1756-IN078B

1756-PA75, -PB75 ControlLogix Power Supply Installation Instructions 1756-IN596A

1756-Series ControlLogix Module Installation Instructions

1756-Series ControlLogix System User Manual 1756-UM001

TIP

ControlLogix Chassis Installation Instructions 1756-IN080C

(Each module has separate installation document.)

Multiple 1756-IN numbers

Many of the above publications are available online from the
Automation Bookstore (www.theautomationbookstore.com).

TIP

Rockwell Software products are provided with extensive tutorials and
online help. We recommend that you use the tutorials and help menus
to learn about these products.

For more information about Rockwell Software products, visit the
Rockwell Software internet site (www.software.rockwell.com).

Publication 1756-UM524B-EN-P - December 2008

P-4 Preface

Notes:

Publication 1756-UM524B-EN-P - December 2008

Table of Contents

Important User Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

Rockwell Automation Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

Product Support. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

Technical Product Assistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

Preface

What This Preface Contains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P-1

Who Should Use This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P-1

Purpose of This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P-1

What This Manual Contains. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P-2

Common Techniques Used in This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . P-3

Related Documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P-3

Chapter 1

About the 1756-CLX/C Module

What This Chapter Contains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

About the 1756-CLX/C Module. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

Module Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

Some Points to Remember . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

About the Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

Hardware/Software Compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

Preventing Electrostatic Discharge. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

Removal and Insertion Under Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

1756-CLX/C Module Architecture. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

Configuration Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

Process Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7

Chapter 2

Install the 1756-CLX/C Module

What This Chapter Contains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

Identify Module Components. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

About the Jumpers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

Install and Connect the Chassis and Power Supply . . . . . . . . . . . . . . . . . . . . . 2-2

Determine Module Slot Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

Install the Module in the Chassis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3

Apply Power to the Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3

Removal and Insertion under Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4

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TOC-ii Table of Contents

Make the Ethernet Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4

Wire the Ethernet Connector. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4

Plug in the Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5

Remove or Replace the Module (When Applicable) . . . . . . . . . . . . . . . . . . . . 2-5

Check Power Supply and Module Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6

Chapter 3

About the NeXUS Network

What This Chapter Contains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

Protocol Structure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

Supported Services . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

Network Organization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3

Supported ADP Message Types. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4

Configuration Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4

IP Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4

Gateways . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6

Subnet Mask . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7

For More Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8

Chapter 4

Configure the 1756-CLX/C Module

What This Chapter Contains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

Configure Your 1756-CLX/C Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

Configuration Software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

Overview of the Configuration Process . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2

Create a New Module. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2

View and Change Module Tags . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5

Configure the Module IP Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6

Chapter 5

Status Indicators and Troubleshooting

What This Chapter Contains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1

Use the LED Status Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2

Use the Communications Port Status Indicators . . . . . . . . . . . . . . . . . . . . . . . 5-3

Use the Alpha-numeric Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3

Publication 1756-UM524B-EN-P - December 2008

Table of Contents TOC-iii

Appendix A

Specifications

Appendix B

Factory-set Jumpers

Appendix C

1756-CLX/C Web Interface

User Screens . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-1

Appendix D

1756-CLX/C Module Backplane Communication Tag List

About the Nexus Communication Flags (NX20 – NX91) . . . . . . . . . . . . . . . D-2

Boot /Reboot 1756-CLX/C Module Procedure. . . . . . . . . . . . . . . . . . . . D-2

1756-CLX/C Module Configuration Check Procedure . . . . . . . . . . . . . D-4

1756-CLX/C System Error Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . D-5

1756-CLX/C Module Sending Procedure . . . . . . . . . . . . . . . . . . . . . . . . D-6

1756-CLX/C Module Receiving Procedure . . . . . . . . . . . . . . . . . . . . . . D-7

Appendix E

1756-CLX/C Module Tag List

Glossary

Index

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TOC-iv Table of Contents

Publication 1756-UM524B-EN-P - December 2008

Chapter

1

About the 1756-CLX/C Module

What This Chapter Contains

This chapter provides an overview of the 1756-CLX/C module, its primary features, what
it does, and how to use it. You will need to understand the concepts discussed in this
chapter in order to configure your module and use it in a control system. The following
table lists where to find specific information in this chapter..

For information about this topic: See page:

About the 1756-CLX/C Module 1-1

Module Features 1-2

Some Points to Remember 1-3

About the Battery 1-4

Hardware/Software Compatibility 1-4

Preventing Electrostatic Discharge 1-5

Removal and Insertion Under Power 1-5

1756-CLX/C Module Architecture 1-6

Configuration Overview 1-6

Process Overview 1-7

About the 1756-CLX/C Module

The 1756-CLX/C Interface Module communicates over a plant-floor local area network
known as NeXUS. The network is based on the Autonomous Decentralized Protocol
(ADP).

The latest copy of the following ADP specification is available at
http://www.mstc.or.jp/jop/misc/spec-e.html:

Manufacturing Science and Technology Center, Japan FA Open Systems
Promotion Group, Distributed Manufacturing Architecture Committee,
“Specifications for Autonomous Decentralized Protocol”, R. 3.0, MSTC/JOP
(September 30, 1999).

Publication 1756-UM524B-EN-P - December 2008

1-2 About the 1756-CLX/C Module

The module mounts into a ControlLogix chassis. It communicates with Logix controllers
across the ControlLogix chassis backplane. The module connects to the NeXUS network
via an Ethernet cable.

Module Features

1756-CLX/C module features include:

• NeXUS (ADP) messaging encapsulated within standard UDP/IP protocol

• interfacing via Ethernet media

• communication to and from ControlLogix controllers in the same chassis

• battery backed-up SRAM

Backplane connector

(interface to the

ControlLogix backplane)

Publication 1756-UM524B-EN-P - December 2008

About the 1756-CLX/C Module 1-3

Alpha-numeric display

Status indicators

Ethernet port with

status indicators

Reset Switch

view; actual switch is

(schematic

inside module)

Some Points to Remember

Remember the following points about the 1756-CLX/C module:

• the module is not supported by RSLinx or RSNetworx software

• the module does not support bridging between NeXUS and ControlNet, DeviceNet,

EtherNet/IP, or any other network

• the module does not support bridging between NeXUS sub-nets (i.e., bridging
between 1756-CLX/C modules located in the same chassis)

• the maximum NeXUS (ADP) message size is 1024 bytes

• data rate is 10Mb/sec.; maximum data rate is 100Mb/sec.

• minimum module data transfer rate is 10 packets/sec.

• the module supports a maximum of 32 TCDs

• one Logix controller can own only one 1756-CLX/C module

ATTENTION

Use only the Ethernet connector on the module. Do not use other
connectors.

Publication 1756-UM524B-EN-P - December 2008

1-4 About the 1756-CLX/C Module

About the Battery

The 1756-CLX/C module uses a rechargeable lithium vanadium pentoxide battery, which,
when fully charged, provides backup power for the SRAM memory for approximately 21
days. The module must be powered for approximately 20 hours before the battery
becomes fully charged. The battery is not accessible, and should last for the life of the
module.

ATTENTION

The lithium battery is not user-replaceable. Do not attempt to access or
replace it. Lithium batteries can be hazardous to humans and the
environment, and should always be handled and disposed of properly.

Hardware/Software Compatibility

The 1756-CLX/C module is compatible with the following firmware versions and
software releases. Contact Rockwell Automation if you need software or firmware
upgrades to use this equipment.

Product Firmware version/software release

ControlLogix Controller 7.09 or higher

RSLogix5000 Software 7.02 or higher

Publication 1756-UM524B-EN-P - December 2008

About the 1756-CLX/C Module 1-5

Preventing Electrostatic Discharge

This module is sensitive to electrostatic discharge.

ATTENTION

Preventing Electrostatic Discharge

This equipment is sensitive to electrostatic discharge, which can cause
internal damage and affect normal operation. Follow these guidelines
when you handle this equipment:

• Touch a grounded object to discharge potential static.

• Wear an approved grounding wrist strap.

• Do not touch connectors or pins on component boards.

• Do not touch circuit components inside the equipment.

• If available, use a static-safe workstation.

• When not in use, store the equipment in appropriate static-safe

packaging.

Removal and Insertion Under Power

ATTENTION

We do not recommend that you install or remove the module under
power.

Publication 1756-UM524B-EN-P - December 2008

1-6 About the 1756-CLX/C Module

1756-CLX/C Module Architecture

The figure below shows how the various components of a system using the 1756-CLX/C
module interact.

Backplane

Backplane

communication

Application (ladder)

Tags (data)

Logix5000 Controller

1756-CLX/C API

1756-CLX/C

module

1756-CLX/C Dlink

Backplane

communication

1756-CLX/C

message handling

SMG/BS

Ethernet port

Configuration Overview

The figure below shows an overview of the configuration process.

Development PC

Setup

(DF, TCD)

IP Address

Data field

ControlLogix tools

Created at sending

Handle (send)

Created at startup

Handle (receive)

Data field (local only) and

multi-cast groups

IP Address and mask

Logix5000 Controller

Application ladder

Ta gs

Send parameters
(DF, MCG, TCD)

Receive parameters

(DF, TCD)

Parameters

(Node, TCP/IP)

(DF, MCG, TCD)

1756-CLX/C

module

Windows

NT 4.0

(UDP/IP)

Publication 1756-UM524B-EN-P - December 2008

About the 1756-CLX/C Module 1-7

Process Overview

The figure below shows the flow of data to and from the 1756-CLX/C module.

Control Logix

ControlLogix

Application ladder

Application (Ladder)

Tags

System Status

System status

(NX20 - NX51)

NX20

NX51





System

System config.

Configuration

(NX00 - NX07)

07

NX00





TAGs

Recv-Parameters

Recv. parameters and

and data NX90,91

data (NX90 and NX91)

Send-Parameters

Send parameters and

and data NX80

data (NX90 and NX91)

Connected Data Transfer

Connected data transfer

System status

System Status

NX51

NX20





(NX20 - NX51)

1756-CLX/C module

NX/SAM

Shared

Shared

memory

System Status

Memory

System status

NX20

NX51





(NX20 - NX51)

LED segment

LED

display

Segment

Display

Functions to Start/Stop

Functions to

NX Dlink

start/stop NX Dlink

(nx_sam_mon.exe)

Unconnected Data Transfer

Management process

Management Process

(nx_sam_man.exe)

(nx_sam_man.exe)

Monitor Process

Monitor process

(nx_sam_mon.exe)

System Configuration

System config. (NX00

NX Dlink daemons and library

Windows NT 4.0 with SP6a (UDP/IP)

Windo ws NT4.0 with SP6a (UDP/IP)

NX00

07





- NX07)

System Transaction

Sys. transact. recv.

Recv Process

(nx_sam_mon.exe)

(nx_sam_srecv .exe)

System Transaction Transaction Data

System transaction Transaction data

Functions to receive

Functions
to receive

NX Dlink daemons and library

Ethernet port

Ethernet Port

Unconnected data transfer

Recv- Process

Receive process

(nx_sam_recv.exe)

(nx_sam_recv.exe)

Functions to send

Functions

Send -Process

Send process

(nx_sam_send.exe)

(nx_sam_send.exe)

to send

1756-CLX/C module

56SAM

Publication 1756-UM524B-EN-P - December 2008

1-8 About the 1756-CLX/C Module

Notes:

Publication 1756-UM524B-EN-P - December 2008

Chapter

Install the 1756-CLX/C Module

What This Chapter Contains

This chapter describes how to install the 1756-CLX/C module into a ControlLogix
chassis.

For information about this topic See page

Identify Module Components 2-1

Install and Connect the Chassis and Power Supply 2-2

Determine Module Slot Location 2-2

Install the Module in the Chassis 2-3

Apply Power to the Module 2-3

Removal and Insertion under Power 2-4

Make the Ethernet Connection 2-4

Remove or Replace the Module (When Applicable) 2-5

Check Power Supply and Module Status 2-6

2

Identify Module Components

Refer to Module Features on page 1-2 for an illustration that will help you identify the
module components.

About the Jumpers

ATTENTION

All jumpers on the 1756-CLX/C module are factory-set and should not
be changed. If you change a jumper by mistake, refer to Appendix B of
this manual to reset it to the proper position.

Publication 1756-UM524B-EN-P - December 2008

2-2 Install the 1756-CLX/C Module

Install and Connect the Chassis and Power Supply

Before you install the module, you must install and connect a ControlLogix chassis and
power supply.

Power Supply

20805-M

1756-A4 Chassis

For information on installing these products, refer to the publications listed in the
following table.

Chassis

Typ e

Series B: 1756-A4, -A7, -A10,

-A13, -A17

Chassis

Installation

Pub. No.

1756-IN08C

Power

Supply

1756-PA72/B Pub. No.

1756-PB72/B

1756-PA75/A Pub. No.

1756-PB75/A

Power Supply

Installation

1756-IN078B

1756-IN596A

Determine Module Slot Location

You can install the module in any slot in the ControlLogix chassis.The figure below shows
chassis slot numbering in a 4-slot chassis. Slot 0 is the first slot and is always the left-most
slot in the rack (the first slot to the right of the power supply).

Slot 0

Power Supply

Slot 1

Slot 2

Slot 3

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Chassis

Install the 1756-CLX/C Module 2-3

Install the Module in the Chassis

1

Align the circuit board with top and
bottom guides in the chassis.

Circuit Board

31275-M

2

Slide the module into the chassis. Make sure the module backplane connector properly
connects to the chassis backplane. Check that the holding clips on the top and bottom of the
module are securely in the locking holes of the rack.

3

The module is properly installed when
it is flush with the power supply or other
installed modules.

31276-M

Apply Power to the Module

Turn ON power. The 1756-CLX/C module performs a self-test. If the module is operating
properly, the OK LED turns GREEN.

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2-4 Install the 1756-CLX/C Module

Removal and Insertion under Power

WARNING

We do not recommend that you install or remove the module under
power.

Make the Ethernet Connection

Wire the Ethernet Connector

The 1756-CLX/C module has an Ethernet port you will use to connect to the NeXUS
network. Use an RJ45 connector to connect to the Ethernet network. Wire the appropriate
connector as shown below:

1 ------ TD+
2 ------ TD­3 ------ RD+
4 ------ NC
5 ------ NC
6 ------ RD­7 ------ NC
8 ------ NC

For detailed connnection information, refer to the EtherNet/IP Media Planning and
Installation Guide, publication ENET-IN001A-EN-P.

8
1

RJ 45

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Install the 1756-CLX/C Module 2-5

Plug in the Connector

Plug the Ethernet connector into the port.

Ethernet port

Remove or Replace the Module (When Applicable)

ATTENTION

IMPORTANT

Before you remove the module, you must disconnect the Ethernet
cable.

If you are replacing an existing module with an identical one, and you
want to resume identical system operation, you must install the new
module in the same slot.

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2-6 Install the 1756-CLX/C Module

1

Push on upper and lower module tabs to
disengage them.

31277-M

2

Slide module out of chassis.

31278-M

Check Power Supply and Module Status

Refer to chapter 5 to use the status indicators to determine that the 1756-CLX/C module is
operating correctly.

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Chapter

About the NeXUS Network

What This Chapter Contains

This chapter provides a brief overview of the NeXUS network. The following table
describes what this chapter contains and where to find it.

For information about this topic: See page:

Protocol Structure 3-1

Supported Services 3-2

Network Organization 3-3

Supported ADP Message Types 3-4

Configuration Requirements 3-4

For More Information 3-8

3

Protocol Structure

The NeXUS network is a TCP/IP over Ethernet type LAN with a manufacturing message
transfer protocol, known as NeXUS, on top, as shown in the table below. This protocol is
known as the Autonomous Decentralized Protocol, or ADP.

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3-2 About the NeXUS Network

OSI Layer NeXUS Network Protocol Comments

Layer 7 - Application NEXUS or ADP See the latest copy of the following

Layer 6 - Presentation Not implemented

Layer 5 - Session Not implemented

Layer 4 - Transport UDP and TCP Most ADP messages are transferred

Layer 3 - Network IP

Layer 2 - Data Link IEEE/802.3 - Ethernet

Layer 1 - Physical IEEE/802.3 - Ethernet

Physical Medium IEEE/802.3 - Ethernet

ADP specification, available at
http://www.mstc.or.jp/jop/misc/spec-e
.html:
Manufacturing Science and
Technology Center, Japan FA Open
Systems Promotion Group,
Distributed Manufacturing
Architecture Committee,
“Specifications for Autonomous
Decentralized Protocol”, R. 3.0,
MSTC/JOP (September 30, 1999).

using the UDP protocol; some are
transferred using the TCP protocol

Supported Services

The ADP protocol provides to application programs 2 means of message transmission:
peer-to-peer and multicast. Because the peer-to-peer message transfer requires a
connection-oriented service as an underlayer, it uses the TCP protocol.

Since multicast transmission is connectionless, multicast messages are sent and received
using the UDP protocol. As with any connectionless service, delivery and sequence of
messages is not guaranteed. Nor is there a flow control mechanism.

TIP

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The 1756-CLX/C module supports multicast transmission services
only.

About the NeXUS Network 3-3

Network Organization

Looking from the top down, a NeXUS network is viewed as a system of islands called
domains, interconnected via a wide area network. Each domain is uniquely identified by a
domain number (DMN), which ranges from 1 to 64. The domain number must be provided
in all ADP PDU headers. DMN 0 is reserved for the domain considered within the scope
of the ADP specification.

A domain is divided into data fields. A data field is an area within which a group of logical
nodes communicates with each other via multicast or peer-to-peer messages. A domain is
uniquely identified by a data field number (DFN) which ranges from 1 through 255 and
must be provided in all ADP PDU headers. One data field is configured per network or
sub-network address of the IP address.

Only nodes belonging to the same data field can communicate with each other. A node can
belong to more than one data field. Relative to a node, a data field can be local or remote
(for example, connected to the node via a router). Only local data fields are considered
within the scope of the ADP specification.

To support multicast communication, nodes within a data field are organized into
multicast groups. A node can be a member of more than one multicast group. A multicast
group is uniquely identified as a multicast group number, or MGN, which ranges from 1 to

255. The MGN must be provided in all multicast ADP PDU headers.

Each NeXUS node, also called a logical node, is uniquely identified by a logical node
number, or LNN, which ranges from 1 to 4095. The LNN must be provided in all ADP
PDU headers.

The user normally assigns and manages DFNs, LNNs, and MGNs. DMN, DFN, and LNN
form the source address (SA). DMN, DFN, and MGN form the destination address (DA)
of an ADP PDU header.

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3-4 About the NeXUS Network

Supported ADP Message Types

The 1756-CLX/C module supports the following communication features referenced in
the ADP specification:

Communication
Feature

Multicast
communication

Alive signal Base-1 4.2 Supported Not supported

Communication

Feature

Test support 4.5 Supported Supported Supported Not supported

Maximum
message length

Class Clause (in ADP

Base-1 4.1 Supported Supported

Clause (in ADP

specification)

- (MTU-92) bytes (MTU-92) bytes

specification)

Requirements for Conformance

Multicast Alive signal

Transmission Reception Transmission Reception

Requirements for Conformance

Transmission Reception

Configuration Requirements

Before you can use your 1756-CLX/C module, you must configure its IP address,
gateway, and subnet mask by specifying parameters NX00 through NX02 on the
Logix5000 controller. Refer to Appendices D and E of this manual for definitions of these
parameters.

IP Address

The IP address identifies each node on the TCP/IP network (or system of connected
networks). Each TCP/IP node on a network must have a unique IP address.

The IP address is 32 bits long and is composed of a net ID, host ID, and/or a multicast ID.
Each network can be a Class A, B, C, or D format. The class of the network determines
how an IP address is formatted.

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