Simbolos de control e instrumentación

STANDARD

ISA–5.3–1983
Formerly ISA–S5.3–1983

Graphic Symbols for Distributed Control/Shared Display Instrumentation, Logic and Computer Systems

NOTICE OF COPYRIGHT
This is a copyrighted document and may not be copied or distributed in any form or manner without the permission of ISA. This copy of the document was made for the sole use of the person to whom ISA provided it and issubject to the restrictions stated in ISA’s license to that person. It may not be provided to any other person in print, electronic, or any other form. Violations of ISA’s copyright will be prosecuted to the fullest extent of the law and may result in substantial civil and criminal penalties.

Approved 30 June 1982
TM

ISA–The Instrumentation, Systems, and Automation Society

ISA-5.3-1983Graphic Symbols for Distributed Control/Shared Display Instrumentation, Logic and Computer Systems ISBN 0-87664-707-7 Copyright ã 1983 by the Instrument Society of America. All rights reserved. Printed in the United States of America. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form or by any means (electronic, mechanical, photocopying, recording,or otherwise), without the prior written permission of the publisher. ISA 67 Alexander Drive P.O. Box 12277 Research Triangle Park, North Carolina 27709

Preface

This preface is included for informational purposes and is not part of ISA-5.3-1983. This Standard has been prepared as a part of the service of ISA toward a goal of uniformity in the field of instrumentation. To be of real value,this document should not be static but should be subject to periodic review. Towards this end, the Society welcomes all comments and criticisms and asks that they be addressed to the Secretary, Standards and Practices Board, ISA, 67 Alexander Drive, P.O. Box 12277, Research Triangle Park, North Carolina 27709, telephone 919549-8411, e-mail: standards@isa.org. The ISA Standards and PracticesDepartment is aware of the growing need for attention to the metric system of units in general, and the International System of Units (SI) in particular, in the preparation of instrumentation standards. The Department is further aware of the benefits to USA users of ISA Standards of incorporating suitable references to the SI (and the metric system) in their business and professional dealings with othercountries. Towards this end this Department will endeavor to introduce SI and SI-acceptable metric units in all new and revised standards to the greatest extent possible. The Metric Practice Guide, which has been published by the American Society for Testing and Materials as ANSI designation Z210.1 (ASTM E380-76. IEEE Std. 268-1975), and future revisions, will be the reference guide fordefinitions, symbols, abbreviations, and conversion factors. The systems referenced in this Standard are based on advances in control systems technology since the publication of ISA-5.1, "Instrumentation Symbols and Identification." During recent years, technology has evolved in terms of microprocessor-based systems presently manufactured by many companies as "Distributed Control Systems." These systems mayinclude components identified as "computers" as distinct from the integral processor, which derives the various functions of the system. The computer component may be integrated into the overall system, via the communication link, or it may be a stand-alone computer. In attempting to implement these systems, the need for supplementary symbolism has become apparent. The symbols defined in ISA-5.3are intended to complement those of ISA-5.1, "Instrumentation Symbols and Identification," for use on flow diagrams. In this way, the integration of distributed controllers and process computers into the more traditional instrument systems — analog, binary, and digital — can be depicted clearly on flow diagrams and other documents to give an overall and comprehensive picture of how process...