Rockwell Automation DEVICENET 1771-SDN User Manual

PLC-5 DeviceNet Scanner Module

1771-SDN

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 this control equipment 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.

The illustrations, charts, sample programs and layout examples shown in this guide 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 manual we use notes to make you aware of safety considerations:

Attention statements help you to:

• identify a hazard

• avoid a hazard

• recognize the consequences

Allen-Bradley, Data Highway Plus, and PLC-5 are trademarks of Rockwell Automation.

ControlNet is a trademark of ControlNet International, Ltd.

DeviceNet is a trademark of Open DeviceNet Vendor Association (ODVA), Inc.

Ethernet is a trademark of Digital Equipment Corporation, Intel, and Xerox Corporation.

RSLinx, RSLogix 5, and RSNetWorx are trademarks of Rockwell Software.

Windows 95/98 and Windows NT are trademarks of Microsoft Corporation.

ATTENTION

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

IMPORTANT

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

European Communities (EC) Directive Compliance

If this product has the CE mark it is approved for installation within the European Union and EEA regions. It has been designed and tested to meet the following directives.

EMC Directive

This product is tested to meet the Council Directive 89/336/EC Electromagnetic Compatibility (EMC) by applying the following standards, in whole or in part, documented in a technical construction file:

•

EN 50081-2 EMC — Generic Emission Standard, Part 2 — Industrial Environment

•

EN 50082-2 EMC — Generic Immunity Standard, Part 2 — Industrial Environment

This product is intended for use in an industrial environment.

Low Voltage Directive

This product is tested to meet Council Directive 73/23/EEC Low Voltage, by applying the safety requirements of EN 61131-2 Programmable Controllers, Part 2 - Equipment Requirements and Tests. For specific information required by EN 61131-2, see the appropriate sections in this publication, as well as the Allen-Bradley publication Industrial Automation Wiring and Grounding Guidelines For Noise Immunity, publication 1770-4.1.

This equipment is classified as open equipment and must be mounted in an enclosure during operation to provide safety protection.

1 Publication 1771-6.5.132 - June 2000

Preface

About This User Manual

Introduction

This user manual is designed to provide you enough information to get a small example application up and running. Use this manual if

you are knowledgeable about DeviceNet

™

and PLC-5™ products, but may not have used the products in conjunction. The information provided is a base; modify or expand the examples to suit your particular needs.

The manual contains instructions on configuring a DeviceNet network using RSLinx and RSNetWorx for DeviceNet software. It also describes how to use the PLC-5 pass-through feature to communicate with the DeviceNet network for adjustment and tuning of network devices via other networks, including:

•

ControlNet

•

Ethernet

•

Data Highway Plus (DH+)

The example application demonstrates how to perform control on DeviceNet using a PLC-5 processor and the 1771-SDN module. You use RSLogix 5 programming software to create a ladder logic program

to control a photoeye and a RediSTATION

™

IMPORTANT

This User manual should be used in conjunction with the 1771-SDN DeviceNet Scanner Module Installation Instructions, publication 1771-5.14. The Installation Instructions contain important information on configuring your scanner.

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P-2 About This User Manual

Contents

This user manual contains the following chapters:

Audience

This manual is intended for control engineers and technicians who are installing, programming, and maintaining a control system that includes a PLC-5 processor communicating on a DeviceNet network through a 1771-SDN module.

We assume that you:

•

are developing a DeviceNet network using a PLC-5 processor in

conjunction with the 1771–SDN scanner module

• know each of your device’s I/O parameters and requirements

• understand PLC-5 processor programming and operation

• are experienced with the Microsoft

Windows™ environment

• are familiar with RSNetWorx for DeviceNet software

Planning Your Configuration

go to Chapter 2

Configuring the DeviceNet Network

go to Chapter 4

Configuring DeviceNet From Another Network

go to Chapter 5

Before You Begin

go to Chapter 1

Setting Up the Hardware

go to Chapter 3

Creating and Running the Application Program

go to Chapter 6

Troubleshooting

go to Chapter 7

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About This User Manual P-3

The Example Application

This manual describes how to set up an example application. The manual provides examples of each step of the setup, with references to other manuals for more details.

System Components

We used the following devices and software for the example application. For your own application, substitute your own devices to fit your needs. The recommended configurations in this user manual will help you set up the test system and get it working. Your eventual configuration will depend on your application.

Note: If you use different software or fimware versions of these products some of your screens may appear slightly different from those shown in the example.

Product Name Catalog Number Series Revision

Qty Hardware

PLC-5C processor

(1)

1785-L20C15, -L40C15, -L80C15 - -

1 1771 Universal I/O chassis 1771-A1B, -A2B, -A3B, -A3B1,

-A4B

B-

1 DeviceNet Scanner module 1771-SDN/B B -

Ethernet Interface module

(2)

1785-ENET - -

1 DeviceNet Quad-Tap 1492-DN3TW - -

1 RediSTATION operator interface module 2705-TxDN1x42x-xxxx - -

1 Series 9000 Photoeye 42GNP-9000 or equivalent

1 DeviceNet RS-232 interface module 1770-KFD - -

1 RS-232 cables 1787-RSCABL/A (PC to 1770-KFD) - -

- DeviceNet dropline or trunkline cables, as needed

1787-PCABL, -TCABL, -MCABL - -

1 24V Power Supply Regulated 24VDC, 8A - -

1 PC IBM-compatible

Windows 95/98, NT 4.0

Software

RSLogix 5 9324-RL5300xxx - 3.22

RSNetWorx for DeviceNet 9357-DNETL3 - 2.11

RSLinx 9355-WABxxx - 2.10

(1)

The minimum requirement for the processor is that it support block transfer instructions. A ControlNet version of the Processor is required if interfacing the DeviceNet network and a ControlNet network (see chapters 5 and 6).

(2)

Required if interfacing the DeviceNet network and an Ethernet network. See chapters 5 and 6.

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P-4 About This User Manual

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.

•

Information in bold contained within text identifies menu windows, or screen options, screen names and areas of the screen, such as dialog boxes, status bars, radio buttons and parameters.

TIP

This symbol identifies helpful tips.

A definition box defines terms that may be unfamiliar to you.

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. Pictures of keys represent the actual keys you press.

The “MORE” icon is placed beside any paragraph that references sources of additional information outside of this document.

This is a definition box. When a word is bold within the text of a paragraph, a definition box will appear in the left margin to further define the text.

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About This User Manual P-5

Where to Find More Information

Refer to the following publications as needed for additional help when setting up and using your DeviceNet network:

For information about See this publication Publication Number

the 1771-SDN DeviceNet scanner 1771-SDN Scanner Module Installation Instructions 1771-5.14

the PLC-5 processor ControlNet PLC-5 Programmable Controllers User Manual

Phase 1.5

1785-6.5.22

PLC-5 Instruction Set Reference Manual 1785-6.1

1785-PLC-5 Programmable Controllers Quick Reference 1785-7.1

the1785-ENET Ethernet interface module PLC-5 Ethernet Interface Module User Manual 1785-6.5.19

the 1771 I/O chassis Universal I/O Chassis 1771-2.210

the 1770-KFD communication module DeviceNet RS-232 Interface Module Installation Instructions 1770-5.6

a 1784-PCD communication card NetLinx DeviceNet Communication Card Installation Instructions 1784-5.29

a 1784-PCID or 1784-PCIDS card DeviceNet PCI Communication Interface Card Installation 1784-5.31

the RediSTATION RediSTATION Operator Interface User Manual 2705-804

the 9000 Series photoeye {refer to the information that came with your photoeye} n/a

DeviceNet DeviceNet System Overview DN-2.5

DeviceNet Design Manual (online) DNET-AT-001A-EN

connecting the DeviceNet network DeviceNet Cable Planning and Installation Manual DN-6.7.2

DeviceNet Cable Planning and Installation Release Note 1 DN-6.7.2-RN1

RSLinx software RSLinx Lite User’s Guide 9399-WAB32LUG

RSLogix 5 software Getting Results With RSLogix 5 9399-RL53GR

RSNetWorx for DeviceNet software DeviceNet Demo CD 9398-DNETDEMO

terms and definitions Allen-Bradley Industrial Automation Glossary AG-7.1

TIP

Many of the above are available online from the Automation Bookstore:

http://www.theautomationbookstore.com

TIP

For more information about Rockwell Software products, visit the Rockwell Software internet site:

http://www.software.rockwell.com

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P-6 About This User Manual

Terminology

This term Means

Bridge The scanner module’s support of explicit message transfer. Change of State A type of I/O data communication. The scanner module can send and

receive data with slave devices that have the change of state feature. Data is sent whenever a data change occurs. Data is updated at the rate of the heartbeat.

Communication Module

The 1771-SDN scanner module or the 1770-KFD module.

Cyclic A type of I/O data communication. The scanner module can send and

receive data with slave devices that have the cyclic feature. Data is only sent at a user-configurable rate.

EDS Electronic Data Sheet. A vendor-supplied template that specifies how

information is displayed as well as what is an appropriate entry (value).

Explicit Messaging

A type of messaging used for lower priority tasks, such as configuration and data monitoring.

Heartbeat Rate Devices that are configured for change of state data can also send a

“heartbeat” signal to indicate proper operation. Host Platform The computer that hosts the 1771-SDN scanner module. I/O An abbreviation for “input and output”. Implicit

Messaging

The type of messaging used for high priority I/O control data; e.g., change

of state, cyclic, polled, or strobed. Input Data Data produced by a DeviceNet device and collected by the scanner module

for a host platform to read. MAC ID The network address of a DeviceNet node. Network The DeviceNet network or the RSNetWorx for DeviceNet software

representation of the network. Node Hardware that is assigned a single address on the network (also referred

to as device). Offline When the PC communication scanner is not communicating on the

network. Online When the PC communication scanner is configured and enabled to

communicate on the network. Output Data Data produced by a host platform that is written to the scanner module’s

memory. This data is sent by the scanner module to DeviceNet devices. PC Abbreviation for an IBM

compatible personal-computer.

Polled A type of input/output-data communication. A polled message solicits a

response from a single, specified device on the network (a point-to-point

transfer of data). Record The node address and channel-specific memory assigned in the scanner

module’s non-volatile storage for a node in the scanlist. Rx An abbreviation for “receive”. Scanlist The list of devices (nodes) with which the scanner is configured to

exchange I/O data. Scanner The function of the 1771-SDN scanner module to support the exchange of

I/O with slave modules. Slave Mode The scanner module is in slave mode when it is placed in another scanner

module’s scanlist as a slave device. Strobed A type of I/O data communication. A strobed message solicits a response

from each strobed device (a multicast transfer). It is a 64-bit message that

contains one bit for each device on the network. Tx An abbreviation for “transmit”.

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About This User Manual P-7

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, plus Rockwell Automation representatives in every major country in the world.

Local Product Support

Contact your local 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, call your local Rockwell Automation representative, or call Rockwell directly at: 1 440 646-6800.

For presales support, call 1 440 646-3NET.

You can obtain technical assistance online from the following Rockwell Automation WEB sites:

•

www.ab.com/mem/technotes/kbhome.html

(knowledge base)

•

www.ab.com/networks/eds

(electronic data sheets)

Your Questions or Comments about This Manual

If you find a problem with this manual, please notify us of it on the enclosed Publication Problem Report (at the back of this manual).

If you have any suggestions about how we can make this manual more useful to you, please contact us at the following address:

Rockwell Automation, Allen-Bradley Company, Inc. Control and Information Group Technical Communication 1 Allen-Bradley Drive Mayfield Heights, OH 44124-6118

Publication 1771-6.5.132 - June 2000

P-8 About This User Manual

i Publication 1771-6.5.132 - June 2000

Table of Contents

Chapter 1

Before You Begin

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

What You Need to Know . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

What Your 1771-SDN Module Does . . . . . . . . . . . . . . . . . . . . 1-2

Address Density and Discrete I/O . . . . . . . . . . . . . . . . . . . . . . 1-4

Communicating with Your Devices . . . . . . . . . . . . . . . . . . . . . 1-6

Communicating with Your PLC-5 Processor. . . . . . . . . . . . . . . 1-7

What 1771-SDN Module Data Tables Are and What They Do . . 1-8

The Scanner Configuration Table (SCT) . . . . . . . . . . . . . . . 1-8

The Scanlist Table (SLT) . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8

RSNetWorx Software as a Configuration Tool . . . . . . . . . . . . . 1-9

RSNetWorx for DeviceNet Configuration Screen Map . . . . 1-10

What’s Next? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11

Chapter 2

Planning Your Configuration and Data Mapping Your Devices

What You Need to Know . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

Beginning the Process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

The Example Network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

Example Network Devices . . . . . . . . . . . . . . . . . . . . . . . . 2-2

RediSTATION Operator Interface Data Mapping. . . . . . . . . 2-4

Mapping RediSTATION Input Data

for a Block Transfer Read . . . . . . . . . . . . . . . . . . . . . . . . . 2-5

Mapping RediSTATION Output Data

for a Block Transfer Write . . . . . . . . . . . . . . . . . . . . . . . . . 2-6

Photoeye Input Data Mapping. . . . . . . . . . . . . . . . . . . . . . 2-7

Mapping Photoeye Input Data for a Block Transfer Read . . 2-8

What’s Next? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9

Chapter 3

Hardware Setup

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

Installing the 1770-KFD Interface Module . . . . . . . . . . . . . . . . 3-1

Installing the PLC-5 Processor . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

Setting the I/O Chassis Backplane Switches . . . . . . . . . . . . 3-2

Going Online to the PLC-5 Processor. . . . . . . . . . . . . . . . . 3-3

Installing the 1785-ENET Ethernet Module. . . . . . . . . . . . . . . . 3-5

Installing the 1771-SDN Scanner Module . . . . . . . . . . . . . . . . . 3-7

Setting the Channel 1 Data Rate

and Node Address Switches . . . . . . . . . . . . . . . . . . . . . . . 3-8

Setting the I/O Chassis Addressing Node Switches . . . . . . . 3-8

Installing the Scanner Module in the Chassis . . . . . . . . . . . 3-9

Connecting the Scanner to the DeviceNet Network . . . . . 3-10

Installing the RediSTATION Operator Interface . . . . . . . . . . . 3-11

Installing the Series 9000 Photoeye . . . . . . . . . . . . . . . . . . . . 3-12

How Your Example System Will Look. . . . . . . . . . . . . . . . . . 3-13

What’s Next? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-13

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Table of Contents ii

Chapter 4

Configuring the DeviceNet Network

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

Installing the Software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

Using RSLinx to Configure the DeviceNet Driver . . . . . . . . . . . 4-2

Using RSNetWorx for DeviceNet to Configure the Scanlist . . . . 4-4

Setting Up an Online Connection . . . . . . . . . . . . . . . . . . . 4-4

Setting the 1771-SDN Node Address . . . . . . . . . . . . . . . . . 4-6

Configuring the I/O Devices . . . . . . . . . . . . . . . . . . . . . . . 4-9

Verifying the Photoeye Configuration. . . . . . . . . . . . . 4-12

Verifying the RediSTATION Configuration . . . . . . . . . 4-13

AutoMapping the Devices into the Scanlist . . . . . . . . . 4-14

Download the Configuration to the Scanner . . . . . . . . 4-17

What’s Next? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-17

Chapter 5

Communicating with DeviceNet from Another Network

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

Where to Find More Information. . . . . . . . . . . . . . . . . . . . . . . 5-2

Communicating with DeviceNet from a ControlNet Network . . 5-3

Configuring the DeviceNet Pass-Through Driver. . . . . . . . . 5-3

Communicating with the DeviceNet Network. . . . . . . . . . . 5-6

Communicating with DeviceNet from an Ethernet Network. . . 5-9

Configuring the Ethernet to PLC-5 Communications Driver . 5-9

Configuring the DeviceNet Pass-Through Driver. . . . . . . . 5-12

Communicating with the DeviceNet Network. . . . . . . . . . 5-15

Communicating with DeviceNet from a DH+ Network . . . . . 5-18

Configuring the DeviceNet Pass-Through Driver. . . . . . . . 5-18

Communicating with the DeviceNet Network. . . . . . . . . . 5-21

What’s Next? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-23

Chapter 6

Creating and Running the Example Application Program

What This Chapter Contains . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1

Installing the Software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2

Creating the Example Application Program . . . . . . . . . . . . . . . 6-2

Downloading and Running the Program . . . . . . . . . . . . . . . . . 6-6

Downloading and Running the Program

via a ControlNet Network . . . . . . . . . . . . . . . . . . . . . . . . . 6-6

Testing the Example Program . . . . . . . . . . . . . . . . . . . 6-8

Downloading and Running the Program

via an Ethernet Network . . . . . . . . . . . . . . . . . . . . . . . . . . 6-9

Testing the Example Program . . . . . . . . . . . . . . . . . . 6-11

Downloading and Running the Program

via a DH+ Network. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-12

Testing the Example Program . . . . . . . . . . . . . . . . . . 6-14

What’s Next? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-14

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Table of Contents iii

Chapter 7

Troubleshooting

What This Chapter Contains . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1

Module Status Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1

Network Status Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2

Node/Error Code Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2

Appendix A 1785-ENET Module Channel Configuration

Configuring the Communications Channel. . . . . . . . . . . . . . . . A-1

Appendix B Installing and Configuring the ControlNet Communications Driver

Installing the 1784-KTCX15 Communication Interface Card . . . B-1

Configuring the 1784-KTCX15 Communications Driver . . . . B-2

Appendix C Installing and Configuring the DH+ Communications Driver

Installing the 1784-KTX Communication Interface Card . . . . . . C-1

Configuring the 1784-KTX Communications Driver . . . . . . . . . C-2

Appendix D Data Map Example

Example Input Mapping Scheme. . . . . . . . . . . . . . . . . . . . . . D-1

Example Characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . D-1

Example Framework . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-2

Input Data Table Formats . . . . . . . . . . . . . . . . . . . . . . . . D-3

Example Output Mapping Scheme . . . . . . . . . . . . . . . . . . . . D-6

Example Characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . D-6

Example Framework . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-6

Output Data Table Formats . . . . . . . . . . . . . . . . . . . . . . . D-7

Index

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Table of Contents iv

1 Publication 1771-6.5.132 - June 2000

Chapter

Before You Begin

What This Chapter Contains

This chapter provides an overview of communication between a

PLC-5 processor and DeviceNet devices via a 1771-SDN module. The

data tables and the RSNetWorx for DeviceNet screens and windows

used to configure the data tables are also described.

The following table identifies what this chapter contains and where to

find specific information.

What You Need to Know

Before configuring your 1771-SDN scanner module, you must

understand:

•

the data exchange between the PLC -5 processor and DeviceNet devices through the 1771-SDN module

•

user-configurable 1771-SDN module data tables

• the role of RSNetWorx for DeviceNet software

For information about See page

What You Need to Know 1-1

What Your 1771-SDN Module Does 1-2

Communicating with Your Devices 1-6

What 1771-SDN Module Data Tables Are and What They Do 1-8

The Scanner Configuration Table (SCT) 1-8

The Scanlist Table (SLT) 1-8

RSNetWorx Software as a Configuration Tool 1-9

RSNetWorx for DeviceNet Configuration Screen Map 1-10

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1-2 Before You Begin

What Your 1771-SDN Module Does

In a typical configuration, the 1771-SDN module acts as an interface

between DeviceNet devices and the PLC-5 processor.

The 1771-SDN module communicates with DeviceNet devices over

the network to:

•

read inputs from a device

•

write outputs to a device

• download configuration data

• monitor a device’s operational status

The 1771-SDN module communicates with the processor in the form

of Block Transfers (BT) and/or Discrete I/O (DIO). Information

exchanged includes:

• device I/O data

• status information

• configuration data

1770-KFD PC Communication Module

PC with RSNetWorx for DeviceNet software

Series 9000 Photoeye

RediSTATION

1305 Drive

FLEX I/O Rack

DeviceNet Devices

DeviceNet Network

PLC-5 Processor

1771-SDN Scanner module

1771 I/O Chassis

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Before You Begin 1-3

A processor to I/O DeviceNet configuration is shown in the following

figure. See the referenced chapters for more information.

Configure SDN module (Chapter 4)

Mapping Table (Chapters 2 and 4)

Input Device

Output Device

Input Data from Device to SDN (Chapter 2)

Output Write by Processor (Chapter 2)

DeviceNet Network

Output Data to Devices from SDN (Chapter 2)

Input Read by Processor (Chapter 2)

Processor to I/O

PC running RSNetWorx for DeviceNet

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1-4 Before You Begin

The 1771-SDN scanner module can also be used to bridge a

DeviceNet network with another network.

Address Density and Discrete I/O

You can use three addressing methods with your 1771-SDN scanner

module. The number of discrete I/O bits you have available for data

transfer is affected by the addressing mode selected.

Configuring Devices and Data Collection on Higher-Level Networks Via PLC-5/SDN

Target Device to be configured

Source Device to collect data

Configuration of device using RSNetWorx (Chapters 4 & 5)

DeviceNet Network

Laptop PC running RSNetWorx

ControlNet, DH+, or Ethernet Network

Collection of status or alarm data (Chapter 6)

SDN scanner module

Industrial workstation running RSView

Addressing Mode Discrete Inputs Discrete Outputs

2-slot 0 bits 0 bits

1-slot 8 bits 8 bits

1/2-slot 24 bits 24 bits

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Before You Begin 1-5

The concept described below applies to both input and output data tables. For example, when using your 1771-SDN in 1-slot addressing mode, you have eight bits of discrete input and eight bits of output available.

The address density is set via dip switches on the 1771-SDN module

and 1771 chassis. For more information about setting your module’s

address density with switches, refer to the 1771-SDN Scanner Module

Installation Instructions, publication 1771-5.14. For more information

about 1771-module addressing, refer to chapter 3 and to your PLC

programmable controller system-level installation manual and design

manual.

In the scanner’s input and output data tables, there is one byte of memory that is reserved for communication between the processor and the scanner. Processor-specific responses from the scanner are read by the processor in this byte of the input data table. Scanner-specific instructions are written to this byte of the output data table.

In 2-slot addressing mode, the only memory that would have been available for discrete data transfer (8 bits) is taken up by scanner/processor communication.

0 bits for discrete data transfer

2-slot addressing

8 bits for discrete data transfer

1-slot addressing

24 bits for discrete data transfer

1/2-slot addressing

In 1-slot addressing mode, there are 16 bits: eight bits for scanner/processor communication, and eight bits for discrete data transfer.

In 1/2-slot addressing mode, there are 32 bits: eight bits used for scanner/processor communication, and 24 bits for discrete data transfer.

= bits reserved for 1771-SDN and

processor communication

= bits available for discrete

data transfer

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1-6 Before You Begin

Communicating with Your Devices

The 1771-SDN module communicates with a device via

strobe, poll,

change of state,

and/or

cyclic

messages. It uses these messages to solicit data from or deliver data to each device. Data received from the devices, or input data, is organized by the 1771-SDN module and made available to the processor. Data received from your PLC-5 processor, or output data, is organized in the 1771-SDN module and sent on to your devices.

IMPORTANT

Throughout this document,

input

and

output

are defined

from the PLC-5 processor’s point of view. Output is data sent from the PLC-5 processor

a device. Input is data

collected by the PLC-5 processor

from

a device.

All data sent and received on a DeviceNet network is in byte lengths. A device may, for example, produce only two bits of input information. Nevertheless, since the minimum data size on a DeviceNet network is one byte, two bits of information are included in the byte of data produced by the device. In this example (only two bits of input information), the upper six bits are insignificant.

A strobe message is a multicast transfer of data (which is 64 bits in length) sent by the 1771-SDN module that solicits a response from each strobed slave device. There is one bit for each of the possible 64 node addresses. The devices respond with their data, which can be as much as 8 bytes.

A poll message is a point-to-point transfer of data (0-255 bytes) sent by the 1771-SDN module that solicits a response from a single device. The device responds with its input data (0-255 bytes).

A change of state message is a transfer of data sent whenever a data change occurs. A user-configurable heartbeat rate can also be set to allow devices to indicate proper operation during intervals between data changes. This does not solicit response data, but may receive an acknowledge message.

A cyclic message is sent only at a user-configurable rate, such as every 10 ms.

1771-SDN Scanner Module

DeviceNet Devices

Input Data Storage

Input Data From DeviceNet Devices

Data from a single device can be mapped to separate 1771-SDN module memory locations. For example,

“On/Off” values can be mapped to one location, diagnostic values to another, etc. This is known as “map segmenting”. This concept is illustrated by byte A, stored separately as segments A1 and A2.

Output Data Storage

Output Data To DeviceNet Devices

Byte

output from the PLC-5 processor

input from the devices to the PLC-5 processor

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Before You Begin 1-7

Communicating with Your PLC-5 Processor

Your processor communicates with the 1771-SDN scanner module via block transfer reads, block transfer writes, and DIO transfers.

Input data, gathered from the network’s devices, is organized within the 1771-SDN and made available for the processor to “read”.

The 1771-SDN module does not send data to your processor. Data transferred between the module and the processor must be initiated by the processor. Output data is sent, or “written”, to the

scanner by your processor. This data is organized in the 1771-SDN module, which in turn passes the data on to your scanned devices via strobe, poll, change of state, or cyclic messages.

A block transfer read (BTR) is a block transfer of data from the 1771-SDN module to the PLC processor. The processor is

reading

the data collected by the 1771-SDN module (i.e., DeviceNet input data).

A block transfer write (BTW) is a block transfer of data from the PLC processor to the 1771-SDN module. The processor is

writing

the data

to the 1771-SDN’s memory (i.e., DeviceNet output data).

PLC-5 Processor

1771-SDN Scanner

Z Y

Discrete Input Image

Block Transfer Data File

Internal Input Data Storage

I/O Map

Input from the devices

Discrete Output Image

Block Transfer Data File

Internal Output Data

I/O Map

Discrete I/O Transfer

Block Transfer Write

Discrete I/O Tra n s f e r

Block Transfer Read

Output to the devices

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1-8 Before You Begin

What 1771-SDN Module Data Tables Are and What They Do

To manage the flow of data between your processor and the network devices, the 1771-SDN module uses the following data tables.

•

1771-SDN Module Configuration Table

•

Scanlist Table

•

Device Input Data Table

•

Device Output Data Table

•

Device Idle Table

•

Device Failure Table

You can configure two of these data tables through RSNetWorx

software. These two tables are stored in the 1771-SDN module’s non-volatile memory and used to construct all other data tables:

•

Scanner Configuration Table (SCT)

•

Scanlist Table (SLT)

The Scanner Configuration Table (SCT)

The SCT controls basic information your 1771-SDN module needs to function on your DeviceNet network. It tells your 1771-SDN module:

•

if it can transmit and receive input and output data

•

how long it waits after each scan before it scans the devices again

•

when to send out its poll messages

The Scanlist Table (SLT)

The SLT supports I/O updating for each of your devices on the network. It also makes it possible for your 1771-SDN module to make device data available to your processor. The SLT tells your 1771-SDN module:

• which device node addresses to scan

• how to scan each device (strobe, poll, change of state, cyclic or

any valid combination)

• how often to scan your devices

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Before You Begin 1-9

•

exactly where in each device’s total data to find the desired data

•

the size of the input data/output data

•

exactly where to map the input or output data for your processor to read or write

RSNetWorx Software as a Configuration Tool

RSNetWorx for DeviceNet software is used to configure the 1771-SDN module’s data tables. This software tool connects to the 1771-SDN module over the DeviceNet network via a PC RS–232 interface (1770–KFD module), or PC Card (1784-PCD, -PCID, or PCIDS).

User Configured Tab le s

Data In This Table RSNetWorx Configuration

Screen

SCT • basic operation

• module parameters

• interscan delay

• background poll ratio

1771-SDN Module Configuration

SLT • device-specific

identification data

Scanlist Editor (SLE)

• data transfer method

• transmit/receive data size

Edit Device I/O Parameters

• input and output data source and destination locations

These values can be configured automatically through the AutoMap function or manually through the Data Table Map.

Interscan delay is the time between I/O scans (polled and strobed). It is the time the 1771-SDN module will wait between the last poll message request and the start of the next scan cycle.

Background poll ratio sets the frequency of poll messages to a device in relation to the number of I/O scans. For example, if the ratio is set at 10, that device will be polled once every 10 scans.

TIP

RSNetWorx for DeviceNet software can also communicate with the 1771-SDN module via a ControlNet, Ethernet, or Data Highway Plus network. See chapter 5.

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1-10 Before You Begin

The configuration screen map below shows the RSNetWorx for DeviceNet screens used to configure the 1771-SDN module and the navigation paths between them. The use of these screens is described in Chapter 4.

RSNetWorx for DeviceNet Configuration Screen Map

The main RSNetWorx for DeviceNet screen.

To automatically map input devices, select the Input tab and click on the AutoMap button.

To automatically map output devices, select the Output tab and click on the AutoMap button.

To access the scanlist, click on the Scanlist tab.

To edit a device’s I/O parameters, double-click on the device in

To access the 1771-SDN scanner Module, double-click on the 1771-SDN icon.

To download the scanlist, click on the Download to Scanner button.

To browse the network, click on the Online button and select the driver.

the scanlist.

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What’s Next?

The remaining sections of this manual provide the following information:

•

Chapter 2 covers the configuration process planning stage through a data mapping example.

•

Chapter 3 describes the hardware setup for the example application.

•

Chapter 4 covers configuration of the DeviceNet network using RSNetWorx for DeviceNet software.

•

Chapter 5 describes how to communicate with a DeviceNet network from another network.

•

Chapter 6 describes how to create, download, and run the example application program.

•

Chapter 7 covers the diagnostics provided for troubleshooting the 1771-SDN module.

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1-12 Before You Begin

1 Publication 1771-6.5.132 - June 2000

Chapter

Planning Your Configuration and Data Mapping Your Devices

This chapter introduces questions you should ask before configuring your 1771-SDN Scanner. In addition, it presents an example DeviceNet network and I/O data mapping scheme for a photoeye and a RediSTATION operator interface module. The following table identifies what this chapter covers and where to find specific information.

What You Need to Know

To map data via your 1771-SDN Scanner module, you must understand:

•

your network requirements

•

how input data is mapped

• how output data is mapped

Beginning the Process

Planning before configuring your 1771-SDN module helps make sure that you can:

• use your memory and bandwidth efficiently

• cater to device-specific needs and requirements

• give priority to critical I/O transfers

• leave room for expansion

For information about See page

What You Need to Know 2-1

Beginning the Process 2-1

The Example Network 2-2

Example Network Devices 2-2

Photoeye Input Data Mapping 2-7

Mapping Photoeye Input Data for a Block Transfer Read 2-8

RediSTATION Operator Interface Data Mapping 2-4

Mapping RediSTATION Input Data for a Block Transfer Read 2-5

Mapping RediSTATION Output Data for a Block Transfer Write 2-6

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2-2 Planning Your Configuration and Data Mapping Your Devices

A very important question to answer is “what is on your network?” You should be familiar with each device’s:

•

communication requirements

•

I/O importance and size

•

frequency of message delivery

You should also ask “how might this network appear in the future?” At this point in your planning, it is advantageous for you to have some idea of how the network could be expanded. I/O data mapping can be performed automatically by the RSNetWorx software. But when mapping your I/O, you also have the opportunity to allot room for future I/O. This can save time and effort in the future.

For example, RSNetWorx will automatically map the devices as efficiently as possible, but the result is that multiple devices may share the same word location in memory. However, you can also have the system map the devices such that no two devices share the same memory location by selecting the “Dword align” option when performing automapping. You can manually map the devices if you need to assign them to specific memory locations.

For details refer to the Help screens provided by the RSNetWorx for DeviceNet software. Additional support can be found at the Rockwell Software website: http://www.software.rockwell.com.

The Example Network

The following example illustrates a data mapping plan for a DeviceNet network. Note that even if the mapping is performed automatically by the RSNetWorx software, you must know where the devices are mapped in order to use them in your network.

Example Network Devices

This example network has the following devices:

• a PC running RSNetWorx for DeviceNet software

• a 1771-SDN Scanner module interfacing a PLC-5 processor with

DeviceNet

• a Series 9000 photoelectric sensor (strobed)

• a RediSTATION operator interface (polled)

+ 109 hidden pages

Rockwell Automation DEVICENET 1771-SDN User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual