Rockwell international ALLEN-BRADLEY 1771-QRD User manual

1771-QRD Pulse Flowmeter Module
Installation and User’s Manual

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.

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

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

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