Allen-Bradley 1771-OFE Manuale utente

Analog Output Module

Cat. No. 1771OFE

User Manual

Allen-Bradley PLCs

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 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

which 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

in part, without written permission of Allen-Bradley Company, Inc.

is prohibited.

Throughout this manual we make notes to alert you to possible injury to

people or damage to equipment under specific circumstances.

ATTENTION: Identifies information about practices or

circumstances that can lead to personal injury or death, property

damage or economic loss.

Attention helps you:

Identify a hazard.

Avoid the hazard.

Recognize the consequences.

Important: Identifies information that is especially important for

successful application and understanding of the product.

Important: We recommend you frequently backup your application

programs on appropriate storage medium to avoid possible data loss.

Important User Information

Summary of Changes

SI

Summary of Changes

This release of the publication contains updated information from the last

release.

Updated Information

This manual has been revised and reformatted to make the manual more

usable.

To help you find new and updated information in this release of the

publication, we have included change bars as shown to the right of this

paragraph.

Summary of Changes

Allen-Bradley PLCs

Summary of Changes

SI

. . . . . . . . . . . . . . . . . . . . . . . . . . . .

Preface P1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Manual's Purpose P1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Audience P1

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Vocabulary P1

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Manual Organization P1

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Related Products P2

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Product

Compatibility

P2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Overview of the Analog Output Module 11. . . . . . . . . . . . . . .

Chapter

Objectives

11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Module Description 11

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

How Analog Modules Communicate with Programmable Controllers 12

Accuracy 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Chapter Summary 13

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Module Installation 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Chapter

Objectives

21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Before Y

ou Install Y

our Analog Module 21. . . . . . . . . . . . . . . . . . . . .

Calculating Power Requirements 21

. . . . . . . . . . . . . . . . . . . . . . . . .

Determine Module Location in the I/O Chassis 22

. . . . . . . . . . . . . . .

Setting Module Configuration Jumpers 22

. . . . . . . . . . . . . . . . . . . . .

Connecting Wiring 29

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Interpreting the Indicator Lights 211

. . . . . . . . . . . . . . . . . . . . . . . . . .

Chapter Summary 211

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Module Configuration 31. . . . . . . . . . . . . . . . . . . . . . . . . . . .

Chapter

Objectives

31. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Configuring Your Module 31

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Configuration Word 33

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Default

Configuration

34. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Data Format 34

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Scaling 36

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Procedure for Configuring Your Module 39

. . . . . . . . . . . . . . . . . . . .

Chapter Summary 39

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table of Contents

Table of Contentsii

Module

Programming

41. . . . . . . . . . . . . . . . . . . . . . . . . . . .

Chapter

Objectives

41. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Block Transfer with the Analog Output Module 41

. . . . . . . . . . . . . . .

Block Transfer Programming Formats 41

. . . . . . . . . . . . . . . . . . . . .

Block Transfer Programming  PLC2 Family Processors Only 42

. . . .

Block Transfer Programming  PLC3 Family Processors Only 46

. . . .

Block Transfer Programming  PLC5 Family Processors Only 48

. . . .

Other Programming Considerations 410

. . . . . . . . . . . . . . . . . . . . . . .

System Expansion Recommendations  PLC2 Processors Only 413

. .

Chapter Summary 413

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Module Status and Input Data 51. . . . . . . . . . . . . . . . . . . . . .

Chapter

Objectives

51. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Reading Data from the Module 51

. . . . . . . . . . . . . . . . . . . . . . . . . .

Chapter Summary 52

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Calibrating

our Output Module 61. . . . . . . . . . . . . . . . . . . . .

Chapter

Objectives

61. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Tools and T

est Equipment

61. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Calibrating Your Module 61

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Voltage

Output V

ersion (1771OFE1) 62. . . . . . . . . . . . . . . . . . . . . .

Current

Output V

ersion (1771OFE2) 66. . . . . . . . . . . . . . . . . . . . . .

Current

Output V

ersion (1771OFE3) 610. . . . . . . . . . . . . . . . . . . . . .

Chapter Summary 612

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Diagnostics and Troubleshooting 71. . . . . . . . . . . . . . . . . . .

Chapter

Objectives

71. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Interpreting the Indicator Lights 71

. . . . . . . . . . . . . . . . . . . . . . . . . .

Read Block Transfer Status Words 72

. . . . . . . . . . . . . . . . . . . . . . .

Chapter Summary 73

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Specifications A1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Block Transfer with MiniPLC2 and PLC2/20 Processors B1.

Multiple GET Instructions B1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Setting the Block Length (Multiple GET Instructions Only) B3

. . . . . . .

Data Table Formats C1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4Digit Binary Coded Decimal (BCD) C1. . . . . . . . . . . . . . . . . . . . . .

Signedmagnitude Binary C2

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Two's Complement Binary C3

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Allen-Bradley PLCs

Preface

P-1

Preface

This manual shows you how to use the analog output module with an

Allen-Bradley programmable controller. It describes methods for

installing, programming, calibrating, and troubleshooting your module.

To make efficient use of your module, you must be able to program and

operate an Allen-Bradley programmable controller. In particular, you must

be able to program block transfer instructions.

In this manual we assume that you know how to do this. If you do not,

refer to the appropriate programming and operations manual for the

processor that you are using.

In this manual we refer to the:

Analog Output Module (cat. no. 1771-OFE) as the “output module”

Programmable Controller as the “processor” or “controller.”

The manual is divided into seven chapters. The following chart shows

each chapter with its corresponding title and a brief overview of the topics

covered in that chapter.

Chapter Title Topics Covered

1Introduction and

Product Description

Description of the module, including general and

hardware features. How modules communicate with

programmable controllers

2Module Installation Power requirements, keying, module location and hard

ware configuration

3Module Configuration Software configurations, output range selection, data

format and data scaling

4Module Programming

Writing data to the module, and other programming

considerations (default block length, block transfer

boundary word, and watchdog timer)

5Module Status and Input Data Reading data from the module

6 Calibration Calibration Procedures

7Diagnostics and Troubleshooting Troubleshooting Guide for Problem Diagnosis

Manual's

Purpose

Audience

Vocabulary

Manual Organization

Preface

P-2

Appendices Title

A Specifications

BBlock Transfer with MiniPLC2 and PLC2/20 Processors

CData Formats

You can install your output module in any system that uses Allen-Bradley

programmable controllers that have block transfer capabilities and the

1771 I/O structure.

For more information on your programmable controllers, contact your

nearest Allen-Bradley office.

The 1771-OFE module can be used with any 1771 I/O chassis.

Communication between the discrete analog module and the processor is

bidirectional; the processor block-transfers output data through the output

image table to the module and block-transfers input data from the module

through the input image table. The module also requires an area in the data

table to store the read block transfer data and write block transfer data. I/O

image table use is an important factor in module placement and addressing

selection. Compatibility and data table use is listed in the following table.

Table P.A

Compatibility

and Use of Data T

able

Use of Data Table Compatibility

Catalog

Number Input

Image

Output

Image

Read

Block

Write

Block

Addressing Chassis

Number

Image

Bits

Image

Bits

Block

Words

Block

Words 1/2Slot 1Slot 2Slot

Chassis

Series

1771OFE 8 8 5 13 Y Y Y A, B

= Compatible with 1771A1, A2, A4

B = Compatible with 1771A1B, A2B, A3B, A3B1, A4B

Y = Compatible without restriction.

You can place your module in any I/O module slot of the I/O chassis.

You can put two output modules in the same module group.

Do not put the module in the same module group as a discrete high

density module.

Avoid placing output modules close to ac modules or high voltage dc

modules.

For a list of publications with information on Allen-Bradley programmable

controller products, consult our publication index (SD499).

Related Products

Product Compatibility

Related Publications

Allen-Bradley PLCs

Chapter 1

1-1

Overview of the Analog Output Module

In this chapter, you will read about:

module features

how analog modules communicate with programmable controllers

module output ranges

The Analog Output Module (cat. no. 1771-OFE) is an intelligent block

transfer module that converts binary or four-digit BCD values (supplied by

your processor) to analog signals at its four module outputs. The module

accomplishes the data transfer with block transfer programming.

Block transfer write (BTW) programming moves up to 13 words of data

from the processor to the module for digital to analog (D/A) conversion in

one program scan. This information is converted to analog signals and is

sent to the appropriate output channels.

A block transfer read (BTR) moves five words of data from the module to

the processor data table, if desired, for diagnostic purposes. The BTR is

discussed in Chapter 7, “Diagnostics and Troubleshooting.”

The module has a scaling feature that converts data sent to the module in

engineering units to the proper analog signals.

You may connect up to four analog output devices--such as valve

positioners, motor speed controllers, signal converters or recorders--to the

analog output module’s four channels. All analog output device inputs

should conform to the voltage or current ratings of each module

output channel.

Module Features

In the programmable controller system, the analog output module provides

the following functions:

four individually isolated differential outputs

selectable scaling to engineering units

selectable data format

selectable voltage ranges (1771-OFE1 only)

no external power required--power is drawn from the 1771 I/O chassis

backplane.

requires only one I/O slot

Chapter

Objectives

Module Description

Overview of the Analog Output Module

Chapter 1

1-2

Output Ranges

There are three versions of the analog output module:

Catalog Number Module Output Output Range

1771OFE1 Voltage

15V dc

010V dc

+10V dc

Selected by

configuration

jumpers

1771OFE2 Current 420mA Factory set

1771OFE3 Current 050mA Factory set

The voltage version (1771-OFE1) voltage output range is selected with

configuration jumpers in the module:

Note: The 1771-OFE1 is shipped with the selection jumpers in the

+10V position.

The current output versions (1771-OFE2 and -OFE3) are factory set.

The processor transfers data to the module (block transfer write) and from

the module (block transfer read) using BTW and BTR instructions in your

ladder diagram program. These instructions let the processor send output

values to the module, establish the module’s mode of operation

(Figure 1.1) and receive status information from the module.

Figure 1.1

Communication

Between Processor and Module

–

To analog output devices

BTW

Programmable

Controller Analog Output Module

Cat. No. 1771OFE

12876

BTR

1. The processor transfers your configuration and output data to the

module via a block transfer write instruction.

How Analog Modules

Communicate with

Programmable Controllers

Allen-Bradley PLCs

Overview of the Analog Output Module

Chapter 1

1-3

2. The module converts the data into proportional voltage or current

outputs.

3. These module outputs drive external analog devices.

4. When instructed by your ladder program, the processor performs a

read block transfer of output values and module status.

5. The processor and module determine that the transfer was made

without error.

6. Your ladder program can use and/or move the data (if valid) before it

is written over by the transfer of new data in a subsequent transfer.

The accuracy of your output module is described in Appendix A.

In this chapter you read about the functional aspects of the output module

and how the module communicates with the programmable controller.

Accuracy

Chapter Summary

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