Allen-Bradley 1771-QRD User manual

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1771-QRD Pulse Flowmeter Module
Installation and User’s Manual
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1–1
copyright 1990 Allen-Bradley Company
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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Related
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
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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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