Allen-Bradley 1771-QRD Manuale utente

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1771-QRD Pulse Flowmeter Module

Installation and User’s Manual

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1–1

Important

This module is designed for use ONLY as an operating control. Where an

operating control failure would result in personal injury and/or loss of

property, it is the responsibility of the system designer or end user to add

devices (safety, limit controls) or other systems (alarm, supervisory

systems) that protect against or warn of control failure.

Solid state equipment has operational characteristics differing from those

of electromechanical equipment. ‘Application Considerations for Solid

State Controls’ (publication SGI–1.1) 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 is acceptable.

In no event will Allen-Bradley Company 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, Allen-Bradley Company cannot

assume responsibility or liability for actual use based on the examples and

diagrams.

No patent liability is assumed by Allen-Bradley Company with respect to

use of information, circuits, equipment or software described in this

manual.

Reproduction of the contents of this manual, in whole or part, without

written permission of the Allen-Bradley Company is prohibited.

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Before You Begin 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Manual's Purpose 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Audience 1

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

Vocabulary 1

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

Overview

of the Manual

1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Warnings and Cautions 2

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

Explosion Hazard 2

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

Related Products 2

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

Product

Compatibility

3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Publications

3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Introduction 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Chapter

Objectives

1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Module Description and General Features 1

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

How the 1771-QRD Works 2

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

How the 1771-QRD Communicates With Programmable Controllers 3

Chapter Summary 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Installation 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Chapter

Objective

1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Installing the 1771-QRD Module 1

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

Power Requirements 1

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

Module

Location in the I/O Chassis

2. . . . . . . . . . . . . . . . . . . . . . .

Module Keying 2

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

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

Wiring 2

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

Electrostatic Discharge 3

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

Module

Installation

3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Indicators 7

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

Chapter Summary 7

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

Module

Programming

1. . . . . . . . . . . . . . . . . . . . . . . . . . . .

Chapter

Objectives

1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Reading Data From The Module 1

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

Overrange and Overflow 2

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

Block Transfer Programming 2

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

Example #1: PLC-5/15 Processor in a Local 1771 Backplane 3

. . . .

Example

#2: PLC-5/15 with Remote I/O

8. . . . . . . . . . . . . . . . . . . .

Example

#3: PLC-3/10 with Remote I/O

12. . . . . . . . . . . . . . . . . . . .

Table of Contents

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Table of Contentsii

More on Overrange and Overflow 1. . . . . . . . . . . . . . . . . . .

Chapter

Objectives

1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Frequency Overrange Flags 1

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

Totalizer Overflow Flags 2

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

Using A Block Transfer W

rite to Reset the T

otalizer(s)

and/or Overflow Flags 3

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

Chapter Summary 5

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

Troubleshooting 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Chapter

Objectives

1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Data Formats 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Block Transfer Write Format From PLC to QRD 1. . . . . . . . . . . . . .

Response from QRD to PLC Block Transfer 1

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

Specifications 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Power Requirements 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Environment 1

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

Agency Approval 1

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

Packaging 1

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

Weight 1

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

Capacity 1

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

Performance 1

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

Operational

Limits

2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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Chapter 1

1–1

Before You Begin

This manual shows you how to apply the 1771–QRD Pulse Flowmeter

Module to an Allen-Bradley PLC system. It describes methods for

installation, programming, and troubleshooting the module. It also

provides examples of how to use the module.

You must be able to program and operate an Allen-Bradley programmable

controller to make efficient use of this module. In particular, you must

know how to program Block Transfer instructions. If you do not, refer to

the appropriate programming and operations manual for the processor you

are using.

We refer to the:

Pulse Flowmeter Module (Catalog No. 1771–QRD) as “the module”, or

“the QRD”.

Programmable Controller as “the processor”.

This manual is divided into 6 chapters. The following table provides a brief

overview of the topics covered in each chapter.

Chapter Title Topics Covered

2 Introduction Description of module including

programmable features

3 Installation Module power requirements, keying chassis

location, field wiring

4 Programming Reading data from the module

Sample programs for various processors

5More on Overrange and Overflow Error codes

Block transfer write rung for resetting

totalizers and/or overflow flags

6 Troubleshooting Symptom/solution guide

Appendix A Data Formats Data formats fore Blcok Transfer Write and

Block Transfer Read

Appendix B Specifications

Manual's

Purpose

Audience

Vocabulary

Overview of the Manual

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Before You Begin

Chapter 1

1–2

Warnings are found in this manual and on the equipment. The following

symbols are used:

WARNING: A warning symbol means people might be injured

if the the procedures are not followed.

CAUTION: A caution symbol is used when machinery could

be damaged if the procedures are not followed. Explosion

Hazard

WARNING: Explosion hazard — substitution of components

may impair suitability for Class 1. Division 2

AVERTISSEMENT: Risque d’explosion — la substitution de

composants peut rendre ce matériel inacceptable pour les

emplacements de Classe 1, Division 2.

WARNING: Explosion hazard — do not disconnect equipment

unless power has been switched off or the area is known to be

non-hazardous.

AVERTISSEMENT: Risque d’explosion — avant de

déconnecter l’équipement, couper le courant ou s’assurer que

l’emplacement est designe non dangereux.

The 1771–QRD Module can be installed in any system that uses

Allen-Bradley PLC–2, PLC–3 or PLC–5 Programmable Controllers with

Block Transfer capability and 1771 I/O structure.

Contact your nearest Allen-Bradley office for more information about

programmable controllers.

Warnings and Cautions

Explosion Hazard

Related Products

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Before You Begin

Chapter 1

1–3

Do not put the module Do not put the module in the same module group

as a discrete high-density module with 2 slot addressing.

Avoid placing the module adjacent to AC modules or high voltage DC

modules.

Consult the Allen-Bradley Industrial Computer Group Publications Index

(SD 499) for more information about programmable controllers.

Product Compatibility

Related Publications

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Before You Begin

Chapter 1

1–4 Artisan Scientific - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisan-scientific.com

Chapter 2

2–1

Introduction

In this chapter you will read about:

1771–QRD Pulse Flowmeter Module features

How the 1771–QRD Module communicates with programmable

controllers

The Catalog No. 1771–QRD Pulse Flowmeter Module is an intelligent

block transfer module that interfaces Programmable Controllers with

magnetic pickups, single channel shaft encoders, and turbine flowmeters,

or with any source of TTL pulses. The module is generally compatible

with, but does not require the use of, turbine flowmeter signal

preconditioning modules. It provides rate and count data in 2’s

complement binary format to the processor data table through block data

transfers.

Rates as high as 10.0 kHz and counts as large as 32,767 are supported. At

overflow, the count continues from zero and an overflow flag is set. The

overflow flag can be reset by the ladder logic. In addition, the PLC can

reset any or all counts directly.

The module functions with reduced performance in PLC–2 systems due to

their three digit BCD operation. Rates as high as 0.999 kHz are permitted

as are total counts of any size, provided that the PLC ladder polls the

module at intervals faster than it can acquire 999 counts.

The 1771–QRD module receives +5 Vdc operating voltage through the I/O

chassis backplane. It draws a maximum of 0.50 A from this supply.

The module is implemented in a 1771 single-density module form factor.

Chapter

Objectives

Module Description and

General Features

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