Rockwell Automation 1747-KE, D17476.12 User Manual

DH-485/RS-232C Interface Module

Catalog Number 1747-KE

User Manual

Important User Information

Solid state equipment has operational characteristics differing from those of electromechanical equipment. Safety Guidelines for the Application, Installation and Maintenance of Solid State Controls, publication SGI-1.1, available from your local Rockwell Automation sales office or online at http://www.literature.rockwellautomation.com, describes some important differences between solid state equipment and hard-wired electromechanical devices. Because of this difference, and also because of the wide variety of uses for solid state equipment, all persons responsible for applying this equipment must satisfy themselves that each intended application of this equipment is acceptable.

In no event will Rockwell Automation, Inc. be responsible or liable for indirect or consequential damages resulting from the use or application of this equipment.

The examples and diagrams in this manual are included solely for illustrative purposes. Because of the many variables and requirements associated with any particular installation, Rockwell Automation, Inc. cannot assume responsibility or liability for actual use based on the examples and diagrams.

No patent liability is assumed by Rockwell Automation, Inc. with respect to use of information, circuits, equipment, or software described in this manual.

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

Throughout this manual, when necessary, we use notes to make you aware of safety considerations.

WARNING

IMPORTANT

ATTENTION

SHOCK HAZARD

BURN HAZARD

Identifies information about practices or circumstances that can cause an explosion in a hazardous environment, which may lead to personal injury or death, property damage, or economic loss.

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

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

• identify a hazard.

• avoid a hazard.

• recognize the consequences.

Labels may be located on or inside the equipment (for example, drive or motor) to alert people that dangerous voltage may be present.

Labels may be located on or inside the equipment (for example, drive or motor) to alert people that surfaces may be dangerous temperatures.

Summary of Changes

The information below summarizes the changes to this manual since the last printing.

To help you find new and updated information in this release of the manual, we have included change bars as shown to the right of this paragraph.

For See page

Updated method of ordering publications P-2

Updated battery location on circuit board 1-2, C-2

Revised JW1 jumper illustration 1-2, 1-4

Revised JW2 jumper illustration 1-2, 1-4

Revised JW4 jumper illustration 1-2, 1-4

Replaced APS with RSLinx software throughout

Updated information on configuring your SLC chassis 4-13

Updated information on configuring your DF1 driver with RSLinx software

4-14

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2 Summary of Changes

Notes:

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Overview

Preface

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

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

Related Documentation . . . . . . . . . . . . . . . . . . . . . . . . P-2

Terms and Abbreviations. . . . . . . . . . . . . . . . . . . . . . . . . . P-2

Conventions Used in This Manual . . . . . . . . . . . . . . . . . . . P-3

Chapter 1

Interface Module Overview . . . . . . . . . . . . . . . . . . . . . . . . 1-1

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

LED Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

Jumper JW1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

Jumper JW2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

Jumper JW4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

Use a Modem with Your Interface Module . . . . . . . . . . . . . 1-5

Use DF1 Protocol and Your Module. . . . . . . . . . . . . . . . . . 1-5

Typical Configurations. . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

Full-duplex (Point-to-point) . . . . . . . . . . . . . . . . . . . . . 1-6

Full-duplex (Network, Example 1) . . . . . . . . . . . . . . . . 1-6

Full-duplex (Network, Example 2) . . . . . . . . . . . . . . . . 1-7

Half-duplex (Local Mode). . . . . . . . . . . . . . . . . . . . . . . 1-8

Half-duplex (Remote Mode) . . . . . . . . . . . . . . . . . . . . . 1-9

Half-duplex (Slave-to-slave Communication) . . . . . . . . . 1-10

Quick Start

Communicate with the Interface Module

Installation and System Configuration

Chapter 2

Required Tools and Equipment . . . . . . . . . . . . . . . . . . . . . 2-1

Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

Unpack the Module . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

Install the Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

Configure the Module . . . . . . . . . . . . . . . . . . . . . . . . . 2-3

Start-up the Module . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3

Chapter 3

DF1 Communication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

Full-duplex DF1 Protocol . . . . . . . . . . . . . . . . . . . . . . . 3-1

Half-duplex DF1 Protocol. . . . . . . . . . . . . . . . . . . . . . . 3-2

Communicate with DH-485 Devices. . . . . . . . . . . . . . . . . . 3-10

DH-485 Token Passing Devices . . . . . . . . . . . . . . . . . . 3-10

DH-485 Non-Token Passing Devices. . . . . . . . . . . . . . . 3-11

Communicate with a Modem. . . . . . . . . . . . . . . . . . . . . . . 3-11

Chapter 4

European Union Directives Compliance . . . . . . . . . . . . . . . 4-1

EMC Directive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

Choose the Module’s Functionality. . . . . . . . . . . . . . . . . . . 4-2

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ii Table of Contents

Module Configuration Using an ASCII Terminal

Add an Interface Module to Your System . . . . . . . . . . . 4-2

Replace a Series A Interface Module in Your System . . . 4-2

Set the Module’s Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4

Configure with an ASCII Terminal . . . . . . . . . . . . . . . . 4-4

Configure Through the Backplane . . . . . . . . . . . . . . . . 4-4

Verify CONFIG Port Configuration . . . . . . . . . . . . . . . . . . . 4-5

Verify DF1 Port Configuration . . . . . . . . . . . . . . . . . . . . . . 4-6

Install Your Module in an Open Slot . . . . . . . . . . . . . . . . . 4-7

Connect Cable to CONFIG or DF1 Ports. . . . . . . . . . . . . . . 4-8

Connect Cable to the DH-485 Port . . . . . . . . . . . . . . . . . . . 4-11

Configure Your SLC Chassis. . . . . . . . . . . . . . . . . . . . . . . . 4-13

Configure the DF1 Driver within RSLinx Software. . . . . . . . 4-14

Configure Your Module. . . . . . . . . . . . . . . . . . . . . . . . . . . 4-15

Complete the Installation of Your Module . . . . . . . . . . . . . 4-15

Chapter 5

ASCII Terminal Configuration . . . . . . . . . . . . . . . . . . . . . . 5-2

Module Configuration with a Terminal Overview . . . . . . . . 5-3

Top Level Setup Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4

Change Parameters for Menus 1 through 4 . . . . . . . . . . 5-4

CONFIG Port Menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-5

CONFIG PORT Setup Parameters . . . . . . . . . . . . . . . . . 5-5

DF1 Port Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-6

DF1 Port Setup Parameters. . . . . . . . . . . . . . . . . . . . . . 5-6

DH-485 Port Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-7

DH-485 Port Setup Parameters . . . . . . . . . . . . . . . . . . . 5-7

DF1 Protocol Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-8

DF1 Full-duplex Setup Menu . . . . . . . . . . . . . . . . . . . . 5-8

DF1 Full-duplex Setup Parameters . . . . . . . . . . . . . . . . 5-9

DF1 Half-duplex Setup Menu . . . . . . . . . . . . . . . . . . . . 5-10

DF1 Half-duplex Setup Parameters . . . . . . . . . . . . . . . . 5-10

Display Parameters Menu . . . . . . . . . . . . . . . . . . . . . . . . . 5-12

Module Configuration Using the Backplane

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Chapter 6

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

Configure the Interface Module from the SLC Processor . . . 6-2 Place the Module into Software Run Mode from

SLC Processor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-4

Read the Module’s Configuration from the SLC Processor . . 6-5

Examine the SLC Processor’s Status Word. . . . . . . . . . . . . . 6-6

SLC Output Status Word to the Interface Module. . . . . . 6-6

SLC Input Status Word from the Interface Module . . . . . 6-6

Status Codes from the Module to the Processor. . . . . . . 6-7

Build the DF1 Configuration Packet . . . . . . . . . . . . . . . . . . 6-8

DF1 Port Setup Parameters. . . . . . . . . . . . . . . . . . . . . . 6-9

Interpret the LED Indicators

Table of Contents iii

DF1 Full-duplex Setup Parameters . . . . . . . . . . . . . . . . 6-10

DF1 Half-duplex Setup Parameters . . . . . . . . . . . . . . . . 6-11

Build the DH-485 Configuration Packet . . . . . . . . . . . . . . . 6-12

DH-485 Port Setup Parameters . . . . . . . . . . . . . . . . . . . 6-12

Build the Modem Init String Configuration Packets . . . . . . . 6-13

Modem Init String for Characters 1 Through 14 . . . . . . . 6-14

Modem Init String for Characters 15 Through 28 . . . . . . 6-15

Use the Real Time Clock . . . . . . . . . . . . . . . . . . . . . . . . . . 6-16

Establish a Data Echo Between the Interface Module and

the SLC Processor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-17

Reset the Interface Module from the SLC Processor. . . . . . . 6-18

Chapter 7

Interface Module Status Indicators . . . . . . . . . . . . . . . . . . . 7-1

Input Image Description . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2

Status Codes from the Module to the Processor . . . . . . . . . 7-3

SLC Fault Code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-3

Application Examples

Specifications

Chapter 8

Basic Configuration Example Using the Backplane . . . . . . . 8-1

Parameter Locations. . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1

Parameter Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-2

Configuration Results . . . . . . . . . . . . . . . . . . . . . . . . . . 8-3

Backplane Configuration User Program. . . . . . . . . . . . . 8-4

Configuration Data Table . . . . . . . . . . . . . . . . . . . . . . . 8-8

Supplementary Example Using the Backplane . . . . . . . . . . 8-9

Real Time Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-9

Parameter Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-9

Data Echo Feature . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-11

RSLogix Software to SLC Network via Modem Example . . . 8-14

Configure the Module’s Serial Port . . . . . . . . . . . . . . . . 8-15

Configure the DF1 Modem Driver Using RSLinx 2.x or

Later. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-16

Go Online using RSLogix 500 Software and RSLinx

Version 2.x and Later . . . . . . . . . . . . . . . . . . . . . . . . . . 8-25

Appendix A

Hardware Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . A-1

Certification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-2

Port Isolation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-2

Maximum Communication Distances . . . . . . . . . . . . . . A-3

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iv Table of Contents

PLC-5 to SLC 500 Communications

Lithium Battery Replacement, Handling, and Disposal

Interface Module Configuration Worksheets

Appendix B

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1

PLC-5 Message Instruction . . . . . . . . . . . . . . . . . . . . . . . . . B-2

Use the SLC 500 CIF File . . . . . . . . . . . . . . . . . . . . . . . . . . B-2

Use the PLC-5 Message Instruction with Word . . . . . . . . . . B-3

Use the PLC-5 Message Instruction with Byte . . . . . . . . . . . B-4

Appendix C

Battery Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-1

Battery Handling. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-3

Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-3

Transportation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-3

Battery Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-5

Appendix D

DF1 Full-duplex . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-2

DF1 Half-duplex . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-3

Index

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Preface

Read this preface to familiarize yourself with the rest of the manual. This preface covers the following topics.

• Who should use this manual

• The purpose of this manual

• Contents of this manual

• Terms and abbreviations

• Conventions used in this manual

Who Should Use This Manual

Purpose of This Manual

Use this manual if you are responsible for designing, installing, programming, or troubleshooting control systems that use Allen-Bradley small logic controllers.

You should have a basic understanding of SLC 500 products, DF1 communications protocol, and DH-485 network communications. If you do not, contact your local Allen-Bradley representative for information on available training courses before using this product.

This manual is a reference guide for the DH-485/RS-232C Interface Module. It describes the procedures you use to install and configure your interface module for application with PLC and SLC controllers.

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2 Preface

Terms and Abbreviations

The following terms and abbreviations are specific to this product. For a complete listing of Allen-Bradley terminology, refer to the Allen-Bradley Industrial Automation Glossary, publication AG-7.1.

ASCII Terminal - an industrial terminal, workstation, or personal computer with terminal mode software (such as PBASE or Windows HyperTerminal) that communicates in alphanumeric mode.

Backplane - a printed circuit board, at the back of a chassis, that provides electrical interconnection between the modules inserted into the chassis.

DF1 - a serial communication protocol capable of delimiting-messages, controlling message flow, detecting and signalling errors, and retrying after errors are detected. See half- and full-duplex.

DH-485 Link - Data Highway-485 link. An Allen-Bradley token-passing baseband link for a local area network based on the RS-485 standard.

Full-duplex - a mode of operation for a point-to-point link with two physical circuits, in which messages or transmission blocks can be sent in both directions at the same time.

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Preface 3

Half-duplex - a mode of operation for a point-to-point or multi-point baseband link with two physical circuits, in which messages or transmission blocks can be sent in one direction or the other, but not both at the same time.

Modem - Modulator/demodulator. Equipment that connects data terminal equipment to a communication line.

RAM - random access memory. The type of memory in which each storage location is by X/Y coordinates, as in core or semiconductor memory. (Tape or bubble memory cannot be random access.) Thus, the data access time is independent of the location of the data. Unless stated otherwise, RAM usually implies read/write and volatile.

RS-232-C - an EIA standard that specifies electrical, mechanical, and functional characteristics for serial-binary communication circuits in a point-to-point link.

RS-422 - an EIA standard that specifies electrical characteristics of balanced-voltage digital interface circuits in a point-to-point link.

Conventions Used in This Manual

RS-423 - an EIA standard that specifies electrical characteristics of unbalanced voltage digital interface circuits in a point-to-point link.

RS-485 - an EIA standard that specifies mechanical and functional characteristics for digital interface circuits. This standard is used in combination with either RS-422 or RS-423.

SLC 500 controller - the SLC 500 family of fixed and modular controllers.

The following conventions are used throughout this manual.

• Bulleted lists such as this one provide information, not procedural steps.

• Numbered lists provide sequential steps or hierarchical information.

• Bold type is used for emphasis

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4 Preface

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Chapter

Overview

This chapter provides:

• an overview of the interface module.

• features (communication ports, LED indicators, and jumpers).

• guidelines outlining the type of modems you can use with the

module.

• a brief discussion on using RSLinx software with your module.

• typical configurations.

Interface Module Overview

Local Host

Modem

The DH-485/RS-232C Interface Module, catalog number 1747-KE, is a communications interface module that acts as a bridge between DH-485 networks and devices requiring DF1 protocol. The DF1 port on the interface module can be configured for RS-232/423, RS-422, or RS-485 devices. Residing in an SLC 500 chassis, the module is ideally used as an interface module, linking remote DH-485 networks via a modem to a central host.

Interface Module Overview

Interface Module

Link Coupler (1747-AIC)

Modem

DH-485

(1747-KE)

Link Coupler (1747-AIC)

DH-485

Link Coupler (1747-AIC)

1 Publication 1747-UM005B-EN-P - March 2006

Remote Network

1-2 Overview

Features

JW4

Battery

JW1

JW2

The features of the module are shown below.

1747-KE Module Features

SERIAL NO.

FRN

CONFIG

12345

DF1

12345

DH485

CAT SER

SLC 500

INTERACE MODULE

6789

LEDs

CONFIG Port

DF1 Port

DH-485 Port

DH-485/RS-232C

5 4 3 2 1

CONFIG

5 4 3 2 1

DF1

DH485

Door Label

9 8 7 6

There are three communication ports on the front of the module. They are:

• CONFIG - used to configure the module with an ASCII terminal. This serial port accommodates RS-232/423, RS-422, and RS-485 communication interfaces. The CONFIG port is capable of operating at 300, 600, 1200, 2400, 4800, 9600, and 19200 Kbps. It is electrically isolated to 500V dc.

• DF1 - used to interface the module to a modem or other user devices using DF1 protocol. This serial port accommodates RS-232/423, RS-422, and RS-485 communication interfaces. The DF1 port is capable of operating at 300, 600, 1200, 2400, 4800, 9600, and 19200 Kbps. It is electrically isolated to 500V dc.

• DH485 - used to interface the module with the DH-485 network. This port is not isolated and cannot directly drive a multi-node DH-485 network. You must use a 1747-AIC link coupler to connect this port to a DH-485 network that includes multiple SLC 500 processors.

The 1747-C11 or 1747-C13 cables can connect the interface module’s DH-485 port to a 1747-AIC link coupler. The 1747-C13 cable can also connect the module’s DH-485 port directly to a single SLC processor.

Publication 1747-UM005B-EN-P - March 2006

See page 4-11 for cable connections.

LED Indicators

485/RS-

232

There are eight LED indicators on the front of the module. These LED indicators are used for module diagnostics and operator interface. The LED indicators and their descriptions are provided below.

LED Indicators

LED Indicator Status

LED Color Status Indication

ACT Green

(1)

The module is receiving power from the backplane, is configured properly, and is placed in Run mode.

Flashing The module requires configuration or is being configured.

485/RS-

485

DF1

INTERFACE

Overview 1-3

232

FAULT

LO W

H/D

OFF The module is not receiving power from the backplane. A fault condition

exists.

485 Green ON The DH485 port is active on the network.

OFF The DH485 port is not active on the network or the module is in Configuration

mode.

CFG Green Flashing The CONFIG port is transmitting or receiving signals.

OFF The CONFIG port is not transmitting or receiving signals.

DF1 Green Flashing The DF1 port is transmitting or receiving signals. (The flashing may occur so

rapidly that the LED indicator appears to be on.)

OFF The DF1 port is not transmitting or receiving signals or the module is in

Configuration mode.

FAULT Red ON A system problem was detected during diagnostics. Cycle power to reset. If it

remains on, contact your Allen-Bradley representative.

OFF No system problems are detected during diagnostics.

BA LOW Red ON The voltage of the battery that backs up configuration RAM is low. A new

battery is needed.

OFF The voltage of the battery that backs up configuration RAM is at an

acceptable level.

H/D Amber ON The module is configured for half-duplex DF1 protocol (local or remote).

OFF The module is not configured for half-duplex DF1 protocol.

F/D Amber ON The module is configured for full-duplex DF1 protocol.

OFF The module is not configured for full-duplex DF1 protocol.

(1)

Indicates normal operation after the module has been configured.

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1-4 Overview

Jumper JW1

JW1 lets you to select the communication interface for the CONFIG port.

Refer to page 4-5.

Jumper JW2

JW2 lets you to select the communication interface for the DF1 port.

Refer to page 4-6.

Jumper JW4

JW4 lets you to select the functionality and mode of the interface module. The orientation of the jumper determines the module’s functionality. A horizontal orientation gives the module functionality equivalent to a series A module (module configuration ID=4209), while a vertical orientation of the jumper accesses the added functionality of a series B module (module configuration ID=3509).

The position of the jumper determines the module’s mode (Configuration or Run), and thus, which method is used to configure the module (ASCII terminal or backplane communications).

Refer to Chapter 4.

Jumper Placement

JW1

CAT SER

SERIAL NO.

SLC 500

INTERACE MODULE

FRN

CONFIG

6789

12345

DF1

6789

12345

JW4

DH485

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JW2

Overview 1-5

Use a Modem with Your Interface Module

The module can be connected to most types of dial-up network or direct connect modems.

IMPORTANT

The type of modems you can use are:

• Manual - typically acoustically-coupled modems. A person on each end of the phone line establishes the connection. They then insert the handsets into an acoustic coupler to complete the connection.

• DTE controlled answer - these unattended modems are attached directly to the phone lines. The interface module acts as the Data Terminal Equipment (DTE), which controls the modem via the DTR, DSR, and DCD signals. The module incorporates timeouts and tests to properly operate these types of modems.

• Auto answer - these modems have self-contained timeouts and tests. They can answer and hang up the phone automatically. The module has no means of controlling an auto-dial modem, but it can be used in conjunction with a separate auto-dialer.

• Direct connect - these modems connect to a dedicated, leased phone line and remain active at all times.

Some modems are designed to respond to the DTR signal by answering the phone whether it is ringing or not. Since the module asserts DTR at all times (except during the hang-up sequence), the phone appears to be busy at all times. Do not use the interface module with any type of modem that answers the phone as soon as DTR is asserted.

Use DF1 Protocol and Your Module

RSLinx software supports DF1 communications directly from your computer’s serial communication port. Connecting a modem to this port lets you to call remote networks and control them as if you were connected locally.

DF1 Protocol

Interface Module (1747-KE)

DF1

DF1 Protocol

1747-C13 Cable

Modem

DF1 Protocol

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Modem

1-6 Overview

Typical Configurations

The following configurations illustrate some of the possible uses for the module.

Full-duplex (Point-to-point)

Interface Module

DF1

Modem

This illustration shows a connection to a single remote SLC node. The 1747-C13 cable eliminates the need for a 1747-AIC link coupler.

(1747-KE)

1747-C13 Cable

Full-duplex (Network, Example 1)

Interface Module

RSLInx

Link Coupler (1747-AIC)

Modem

Link Coupler (1747-AIC)

This illustration shows a connection to a remote DH-485 network of up to 31 SLC nodes.

(1747-KE)

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Full-duplex (Network, Example 2)

RSLinx

Modem Host computer is capable of calling and interfacing with one network at a time.

Overview 1-7

Interface Module

(1747-KE) Link Coupler (1747-AIC)

Modem

Link Coupler (1747-AIC)

Modem

Link Coupler (1747-AIC)

Interface Module (1747-KE)

Link Coupler (1747-AIC)

Modem

Link Coupler (1747-AIC)

Interface Module (1747-KE)

This configuration allows the host to call more than one remote network (one network connected at a time). Each remote network can consist of up to 31 SLC nodes.

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1-8 Overview

Half-duplex (Local Mode)

Half-duplex (Local Mode) Master

Interface Module

PLC-5 processor

Modem

Link Coupler (1747-AIC)

Modem

Link Coupler (1747-AIC)

This configuration allows the host controller to interface on a remote DH-485 network of up to 31 SLC nodes using the half-duplex protocol.

(1747-KE)

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Half-duplex (Remote Mode)

Half-duplex (Remote Mode) Master

SLC 5/05 processor

Overview 1-9

Dedicated Line

Modem

Interface Module (1747-KE)

Dedicated Line

Modem

Dedicated Line Modem

Interface Module (1747-KE)

Group 01Group 00

Dedicated Line Modem

Interface Module (1747-KE)

Group

This illustration shows a host connect up to eight groups of DH-485 networks, connecting up to a total of 254 SLC nodes.

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1-10 Overview

Half-duplex (Slave-to-slave Communication)

Link Coupler

Link Coupler (1747-AIC)

SLC 5/05 processor

Dedicated Line

Modem

(1747-AIC)

Interface Module (1747-KE)

(DF1 Slave)

RSLinx

(DF1 Slave)

Dedicated Line

Modem

Dedicated Line

Modem

Link Coupler (1747-AIC)

This configuration allows a DF1 slave device send a message to another DF1 slave device. In this example, RSLinx can communicate to an SLC slave.

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Chapter

Quick Start

This chapter can help you to get started using the DH-485/RS-232C Interface Module (catalog number 1747-KE). The procedures included here assume that you have a basic understanding of SLC 500 products. You should understand electronic process control and be able to interpret the ladder logic instructions required to generate the electronic signals that control your application.

Because it is a start-up guide, this chapter does not contain detailed explanations about the procedures listed. It does, however, reference other chapters in this book where you can get more information about applying the procedures described in each step.

Required Tools and Equipment

If you have any questions or are unfamiliar with the terms used or concepts presented in the procedural steps, always read the referenced chapters and other recommended documentation before trying to apply the information.

This chapter:

• tells you what tools and equipment you need.

• lists preliminary considerations.

• explains how to install the module.

• describes when to configure the module.

• discusses system start-up procedures.

Have the following tools and equipment ready.

• Medium blade screwdriver

• Programming equipment (RSLogix 500 software)

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2-2 Quick Start

Procedures

Unpack the Module

Remove the items from the package making sure that the contents include:

• DH-485/RS-232C Interface Module (catalog number 1747-KE).

• cable (1747-C13).

• installation instructions, publication 1747-IN006.

If the contents are incomplete, call your local Rockwell Automation representative for assistance.

Install the Module

ATTENTION

Do not install or remove the 1747-KE module from the SLC chassis until all power dissipates from the SLC 500 power supply (approximately 10 seconds).

Install the module and configure the SLC chassis. The following steps summarize these procedures.

1. Choose the module’s functionality.

2. Select the configuration method you want to use and place your

module in the corresponding mode using JW4.

3. Set your CONFIG and DF1 ports using JW1 and JW2.

4. Configure your SLC chassis using RSLogix 500 software.

5. Configure the module.

6. If your module is still in Configuration mode, place it in Run

mode using the JW4 jumper.

7. Connect your DH-485 and DF1 cabling.

8. Turn on power and verify module status.

For more information refer to Chapter 4 (Installation and System Configuration).

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Quick Start 2-3

Configure the Module

Configure the module by either connecting to an ASCII terminal or communicating through the backplane.

For more information, see Chapter 5 (Module Configuration Using an ASCII Terminal) and Chapter 6 (Module Configuration Using the Backplane).

Start-up the Module

Power up your system by performing standard start-up procedures as indicated in your processor manual. No special start-up procedures are required when using the module.

Before applying power to the module, make sure:

• the module is installed in the SLC chassis.

• all communication devices are connected.

• your SLC processor is configured to operate with the interface

module.

Refer to Chapter 4 for more information.

• your interface module is configured properly.

Refer to Chapters 5 and 6 for more information.

When power is applied to the SLC system, the SLC processor and module run through a power cycle diagnostic sequence. After the diagnostics are successfully completed, the SLC processor enters Run mode and normal operation begins.

ATTENTION

This module is a device used for communications. Improper configuration or module failure may cause communications to stop. Be careful to avoid system designs that would cause potential safety concerns within the system in the event of a communications failure.

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2-4 Quick Start

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Chapter

Communicate with the Interface Module

This chapter explains:

• full- and half-duplex DF1 communication.

• local and remote half-duplex operation.

• communicating with master and slave DH-485 devices.

• communicating with a modem.

DF1 Communication

The module supports full-duplex DF1 protocol and half-duplex DF1 slave protocol on its RS-232 connection to the host computer (using the DF1 Port). The details of these protocols can be found in the DF1 Protocol and Command Set Reference Manual, publication 1770-RM516.

Full-duplex DF1 Protocol

Full-duplex DF1 protocol is provided for applications where high performance peer-to-peer communication is needed.

In full-duplex mode, the module can send embedded responses. If the embedded response detect option is set to auto-detect embedded response, the module will not send embedded responses until it receives one from the host. The module makes an assumption that if a host computer sends embedded responses, it can also receive them.

In full-duplex mode, the destination address in a packet sent from the host computer to the module is the address of the DH-485 node for which the packet is intended. The source address in packets received by the host computer from the module is the node address of the sender.

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3-2 Communicate with the Interface Module

Full-duplex (Point-to-point)

Interface Module

RSLinx

Modem

(1747-KE)

1747-C13 Cable

This illustration shows a connection to a single remote SLC node. The 1747-C13 cable eliminates the need for a 1747-AIC link coupler for connections to one node.

Full-duplex (Network Example)

Interface Module

RSLinx

Link Coupler ((1747-AIC)

Modem

Link Coupler ((1747-AIC)

(1747-KE)

This illustration shows a connection to a remote DH-485 network of up to 31 SLC nodes.

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Half-duplex DF1 Protocol

The module provides two modes of half-duplex addressing: local and remote. Local mode is provided for compatibility with earlier DF1 products, such as the Data Highway/Data Highway Plus Asynchronous Interface Module (catalog number 1770-KF2) and when only one interface module is used in the system.

Communicate with the Interface Module 3-3

You may prefer local mode for use in applications where the RS-232C link is not networked, since it simplifies the polling algorithm.

Remote mode should be used when more than 31 SLC nodes are required on the DH-485 network. Because the interface module is transparent to the master device, existing drivers can be used without rewriting.

Local Mode

Local mode requires an intelligent master device, capable of specifying both a station address and a destination address. Because the interface module acts as a slave on a half-duplex network, the half-duplex master’s access to the DH-485 node is indirect. The destination address and the station address are generally different.

In local mode, the polling algorithm used by the half-duplex master is simplified so that the master only needs to poll the single interface module. The module will respond to messages from the half-duplex master only if the station address contained in these messages is the node address of the interface module. The module then forwards the packet to the appropriate DH-485 node, as defined by the destination address.

Responses from remote nodes on the DH-485 network contain a destination address equal to that of the interface module, and not that of the half-duplex master device. The module responds to poll packets from the half-duplex master by returning whatever data has been forwarded to it by the remote nodes under its jurisdiction.

In the Local Mode illustration on page 3-4, the half-duplex master only polls the interface module at station address 01.

Messages from the half-duplex master to the SLC 500 controllers are sent using a master message containing both the station address of the interface module (node 01) and the destination address of the SLC 500 controller (node 03 for example). Responses from the SLC 500 controllers to the half-duplex master contain the destination address of the interface module (node 01), which then returns all responses to the half-duplex master station upon being polled.

During configuration of the interface module, the module’s destination address, or slave address, is selected if Local mode has been selected.

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3-4 Communicate with the Interface Module

Local Mode

PLC 5 controller

DF1 Master

Remote Mode

Link Coupler ((1747-AIC)

RS-232C DF1

Link Coupler ((1747-AIC)

DH-485

SLC 500

Node 02

DH-485

Link Coupler ((1747-AIC)

SLC 500

Node 01

SLC 500

Node 03

SLC 500

Node 00

The valid range of slave addresses on a half-duplex network is 000 through 376 octal (000 through 254 decimal) accommodating a total of

255 devices. The valid range of addresses on a DH-485 network is 00 through 37 octal (00 through 31 decimal).

To let addressing of up to 255 DH-485 nodes, eight groups (group numbers 00 through 07) of DH-485 networks are established. Each group number defines a DH-485 network, which can consist of up to 32 nodes each (except for group 07 which is limited to 31 nodes).

Refer to the table on page 3-6.

During configuration of the interface module, the module’s group number is selected if Remote mode has been selected.

In remote mode, the module appears transparent to the half-duplex master, so that remote SLC 500 controllers can be polled directly as individual slaves on the half-duplex network. The interface module responds to the half-duplex master if the station address specified corresponds to the node address of any (token-passing) station on the DH-485 network connected to that interface module.

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