Binary Logic Diagrams for Process Operations

1 american National (R 1992)Reaffirmed July 13, 1992 Binary Logic Diagramsfor Process OperationsCopyright 1992 by the Instrument Society of America. All rights reserved. Printed in the UnitedStates of America. No part of this publication may be reproduced, stored in a retrieval system, ortransmitted in any form or by any means (electronic, mechanical, photocopying, recording, orotherwise), without the prior written permission of the Alexander Box 12277 Research Triangle Park, North Carolina Binary Logic Diagrams for Process OperationsISBN 0-87664-331-4 (R 1992)

2 3 PrefaceThis preface is included for informational purposes and is not part of Standard 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. Toward 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, Box 12277, Research Triangle Park, NC 27709, Telephone (919) 549-8411, e-mail: ISA Standards and Practices Department 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.

3 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 other countries. Toward this end this Department will endeavor to introduce 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 (ASTM E380-76, IEEE Std.)

4 286-1975), and further revisions, will be the reference guide for definitions, symbols, abbreviation, and conversion is the Policy of ISA to encourage and welcome the participation of all concerned individuals and interests in the development of ISA Standards. Participation in the ISA Standards making Process by an individual in no way constitutes endorsement by the employer of that individual of ISA or any of the Standards which ISA system described in this Standard is intended to meet the needs of people who are concerned with the operation of Process systems.

5 The guide for the Standard was american National Standards Institute (ANSI) Standard , Graphic Symbols for Logic Diagrams , which the committee attempted to follow so far as practical for the intended users of the ISA Committee also referred to National Electric Manufacturers Association Standards ICS 1-102, Graphic Symbols for Logic Diagrams , whose symbols bear resemblance to those of the ANSI Standard, and ICS 1-103, Static Switching Control Devices, which may eventually be supplanted by ICS 1-102.

6 Reference was also made to National Fluid Power Association Recommended Standard , Graphic Symbols for Fluidic Devices and Circuits. In addition, numerous other industrial standards were following people served on the 1976 Committee:NAMECOMPANYG eorge Platt, ChairmanBechtel Power CompanyEdward J. BlahutProcon Incorporated, Pacific OperationsSanford ChalfinFluor CorporationLouis CosteaHunt-Wesson Foods, IncorporatedRussell C. GreerBailey Meter CompanyRoy LazarCarnation Company4 (R 1992)Frank Mehle (deceased)Procon Incorporated, Pacific OperationGary L.

7 PierceShell Oil CompanyChuck SimmsFisher Controls CompanyJohn VanceUnited Process Control SystemsRobert WooLos Angeles Department of Water & PowerThe following people served on the 1981 (reaffirmation) Committee:NAMECOMPANYR ussell C. Greer, ChairmanBailey Controls CompanyEdward J. BlahutBlahut Engineering, ChalfinFluor Corporation (retired)Louis CosteaHunt-Wesson Foods, LazarCarnation CompanyGary L. PierceShell Oil CompanyGeorge PlattBechtel Power CorporationCharles SimmsFisher Controls CompanyJohn VanceComsyscoRobert WooLos Angeles Department of Water & PowerThe 1976 edition of this Standard was approved by the ISA Standards and Practices Board in November, B.

8 Miller, ChairmanMoore Products CompanyP. BlissPratt & Whitney Aircraft CompanyE. J. ByrneBrown & Root, CalderThe Foxboro CompanyB. A. ChristensenContinental Oil CompanyL. N. CombsE. I. du Pont de Nemours & Company (retired)R. L. GalleyBechtel Power CorporationR. G. Hand, SecretaryISAT. J. HarrisonIBM CorporationT. S. ImslandFisher Controls CompanyP. S. LedererNational Bureau of StandardsO. P. Lovett, I. du Pont de Nemours & CompanyE. C. MagisonHoneywell, L. MartinTex-A-Mation Engineering P.

9 McCauleyGlidden-Durkee Div. SCM CorporationT. A. MurphyThe Fluor Corporation, L. NickensReynolds Metals CompanyG. PlattBechtel Power CorporationA. T. UpfoldPolysar A. WhitmanAllied Chemical (R 1992)5 This standard was reaffirmed by the ISA Standards and Practices Board in March, J. Harrison, ChairmanIBM CorporationP. BlissConsultantW. CalderThe Foxboro CompanyB. A. ChristensenContinental Oil CompanyM. R. Gorden-ClarkScott Paper CompanyR. T. JonesPhiladelphia Electric CompanyR. KellerBoeing CompanyO.

10 P. Lovett, ValveE. C. MagisonHoneywell, P. McCauleyDiamond Shamrock CorporationE. M. NesvigERDCO Engineering CorporationR. L. NickensReynolds Metals CompanyG. PlattBechtel Power CorporationR. PrescottMoore Products CompanyR. W. SignorGeneral Electric CompanyW. C. WeidmanGilbert Associates, A. WhitmanAllied Chemical CorporationL. N. Combs* R. L. Galley*R. G. Marvin*W. B. Miller*Moore Products CompanyJ. R. Williams*Stearns-Rogers, Inc.*Director (R 1992)7 Contents1 Purpose ..92 Scope .. 93 Use of symbols.