IEC IEC TR 61511-0 Edition 1.02018-01 TECHNICAL REPORT Functional safety - Safety instrumented systems for the process industry sector: Part 0: Functional safety for the process industry and IEC 61511 INTERNATIONAL ELECTROTECHNICAL COMMISSION ICS 13.110, 25.040.01 ISBN 978-2-8322-5302-1 Warning! Make sure that you obtained this publication from an authorized distributor. ? Registered trademark of the International Electrotechnical Commission IEC TR 61511-0:2018 @ IEC 2018 CONTENTS FOREWORD 3 Scope. 5 Normative references 5 2 Terms and definitions 3 Process industry environment and the Safety Instrumented System (SiS).. 4 ..5 4.1 General... 5 4.2 Safety InstrumentedFunctions (SIF) 6 4.3 Safety Instrumented System (SiS) components.. 6 IEC 61511- Part 1. 5 6 IEC 61511- Part 2.. 6 .8 7 IEC 61511-Part 3. 8 Utilization of IEC 61511 in system design. 8 Figure 1 - SiS safety life-cycle phases and functional safety assessment (FsA) stages..... IEC TR 61511-0:2018 @IEC 2018 - 3 - INTERNATIONALELECTROTECHNICALCOMMISSION FUNCTIONAL SAFETY SAFETY INSTRUMENTED SYSTEMS FOR THE PROCESS INDUSTRY SECTOR - Part 0: Functional safety for the process industry and IEC 61511 FOREWORD The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of IEC is topromote international co-operation on all questions concerning standardization in the electrical and electronic fields. To Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as "TEC Publication(s)"). Their preparation is entrusted to technical committees; any IEc National Committee interested agreementbetweenthetwo organizations. 2) The formal decisions or agreements of IEc on technical matters express, as nearly as possible, an international interestedIECNational Committees. Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any misinterpretation by any end user. between any IEc Publication and the corresponding national or regional publication shall be clearly indicated in the latter. 5) IEc itself does not provide any attestation of conformity. Independent certification bodies provide conformity assessment services and,in some areas,access to IEC marks of conformity.IEC is not responsible for any services carried out by independent certification bodies. 6) All users should ensure that they have the latest edition of this publication. 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and Publications. 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is indispensable for the correct application of this publication. 9) Attention is drawn to the possibility that some of the elements of this IEc Publication may be the subject of patent rights.IEC shall not be held responsible foridentifying any or all suchpatent rights. The main task of IEC technical committees is to prepare International Standards. However, a technical committee may propose the publication of a technical report when it has collected data of a different kind from that which is normally published as an International Standard, for example"state of the art". IEC TR 61511-0, which is a technical report, has been prepared by subcommittee 65A: System aspects, of IEc technical committee 65: Industrial-process measurement, control and automation.