The new international standard iec 61508 provides a generic framework for achieving functional safety through a risk reduction methodology. This application note is intended to provide a brief introduction to the. Iec 61508 consists of the following parts, under the general title functional safety of electrical electronicprogrammable electronic safety related systems. Pdf functional safety and iec 61508 a basic guide velibor. The need for functional safety capability has been described in chapter 2, section 2. Programmable electronic systems based on iec 61508 iso 26262. For the first time, iec 61508 provided an internationally accepted standard for. The risk assessment framework before attempting to carry out an fsa, it is essential that the general principles of. Developing the safety lifecycle model and functional safety management system. Pdf introduction to functional safety requirements for. The international safety standards iec 61508 ed2 and iec. Iec 61508 is an international standard published by the international electrotechnical commission consisting of methods on how to apply, design, deploy and maintain automatic protection systems called safetyrelated systems. Background on functional safety standards and the safety lifecycle at the turn of this century, the international electrotechnical commission published the very first version of functional safety standard iec 61508 iec61508.
The standard is divided into seven parts, in this paper we will focus on the verification and validation of safety related software in section, part 3. The data provided with these products allow the user to integrate them into safety systems, to the iec 61508 standard, and then state with confidence that the system meets the safety requirements. If there is a possibility that eepe technologies might be used, the standard should be applied so that the functional safety requirements for any eepe safety related systems are determined in a. The functional safety management system shall meet the requirements of the basic safety standard iec 61508 1. Safety certification demonstrates compliance with a safety standard, such as iec 61508, the basic functional safety standard for electrical, electronic, and programmable electronic safety related systems and industryspecific standards, such as iec 62304 for medical devices, iso 26262 for vehicles, iec 60880 for nuclear power plants, en. If you select the redline option, you will receive the official standards in both english and french. A full iec 61508 safety case was prepared using the safetycase. Report introduces the concept of functional safety and gives an overview of the iec 61508 series. Iec 61508 is a basic safety publication of the international electrotechnical commission iec. The release and adoption of iec 61508 and iec 61511 has created new requirements for all organizations involved with equipment used. Guidelines on the application of iec 61508 2 and iec 61508 3, first edition, 2000. Sis, safety integrity levels sil honeywell process solutions.
Iec 61511 is an application specific adaptation of iec 61508 for the process industry sector. Iec 61508 understanding functional safety assessment. While development life cycle models address a single system, one application of the safety lifecycle may address a number of systems the euc, its control system, and any safety related systems on which relevant safety functions are implemented. Functional safety of electgricalelectronicprogrammable electgronic safetyrelated systems, part 7. In iec 61508 part 2 its table 1 describes the lifecycle activities again and is more or less a repeat of part 1. Available for subscriptions available in packages standard is included in.
Functional safety iec 61508 and iso 26262 are the two major standards that rule the certification of functional safety equipment. Abb your partner in functional safety minimizing risk to. Full functional safety assessment according to iec 61508 of the product development processes according to the safety lifecycle phase 9 of iec 61508 1. Oct 14, 2016 the functional safety assessment was performed to the requirements of iec 61508.
The basic approach for tackling the hazards at hand is generally similar for all the functional safety standards discussed here. In 1997 the iec published the standard iec 61508, functional safety of electricalelectronicprogrammable electronic safetyrelated systems. Iec 61508, functional safety, safety integrity level, sil. The purpose of the assessment was to investigate the compliance of. Whereas iec 61508 describes a fully risk based approach for determining sil safety integrity level requirements. As such, it is an umbrella document covering multiple industries and applications. Functional safety and safety certification ultimate guide. In order to promote public education and public safety, equal justice for all, a better informed citizenry, the rule of law, world trade and world peace, this legal document is hereby made available on a noncommercial basis, as it is the right of all humans to know and speak the laws that govern them. Functional safety of electricalelectronicprogrammable electronic safetyrelated. Practical and robust implementation of the iec functional safety.
International standard iec 615081 the iec webstore. This article explains the hazard and risk assessment processes that need to be followed within an fsa, and highlights some of the pitfalls that can be encountered in applying iec 61508. Pdf introduction to functional safety requirements for electrical. Learn more about the cookies we use and how to change your settings. This is a simple measure of the proportion of hardware failures that are either safe, or dangerous but detected, compared. The parts of iec 61508 part title 0 functional safety and iec 615081 1 general requirements.
Millions of everday devices function safely and efficiently together because they meet the requirements specified in iec international standards and conformity assessment systems. The safety integrity level sil provides a target to attain for each safety function. Sif a safety instrumented function sif is a safety function with a speci. Iec 61508 functional safety management assessment report. An electrical thermometer without a temperature transmitter, for example a resistance thermometer or a thermocouple, is not covered by iec 61508, since for. Iec 61508 part 2 as well as part 3 for the software expects this to have been addressed. Procedures shall be in place to demonstrate the adequacy of the functional safety management system. Safety instrumented system functional safety assessment. A full iec 61508 safety case was prepared, using the exida safetycasedb tool, and used as.
For instrumented safety systems, special reference is made to iec 61508 and this document as the recommended standard for specification, design and operation of such safety systems. Functional safety iec 61508 stds pdf free download. Iec 61508 is the standard governing functional safety of programmable electronic systems. The overall title of iec 61508 is functional safety of electrical, electronic and programmable electronic eepe safety related systems. Harm is the basic notion of what you dont want, and the basis for explaining a notion of safety as, say, absence of harmful events, although, s we shall see, this is not how iec 61508 does it. A primary objective of the standard is to help individual industries develop supplemental standards. Iec 61508 is an international standard for the functional safety of electrical, electronic, and programmable electronic equipment. Electricalelectronicprogrammable electronic safetyrelated. Dec 02, 2020 these include coverage for iso 26262, iso 21448, iec 61508, iso 849, ul iec 60730, ul 1998, ul 991, sae 3061, iso 21434, iec 62443, sae 3016 and ul 4600. Functional safety of electricalelectronic programmable electronic. Iec 61508 functional safety of electricalelectronicprogrammable.
A full iec 61508 safety case was prepared using the exida safetycase tool as the primary audit tool. Jun 05, 2020 each has defined their own scheme based upon iec 615804 other functional safety standards. Functional safety and safety certification ultimate. Iec 61508 6, functional safety of electrical electronic programmable electronic safety related systems, part 6. A list of all parts of the iec 61508 series, published under the general title functional safety of electrical electronic programmable electronic safety related systems, can be found on the iec website. Iec 61508 functional safety of electricalelectronic and programmable electronic iec 61508 is the foundational source for good software methods, techniques and tools to support functional safety. Pdf this presentation gives an introduction to functional safety.
The functional safety assessment was performed to the requirements of iec 61508, sil 3. Iec 61508 is also intended for use as a standalone standard. Electric and electronic devices can be certified for use in functional safety applications according to iec 61508, providing application developers the evidence required to demonstrate that the application including the device is also compliant. We also offer tailored and customized training based on software safety, cybersecurity, risk assessment, failure modes effects and diagnostics analysis fmeda calculations, and other. Iec 61508 is the international standard for safety related systems associated with electrical, electronic and softwarebased technologies. The functional safety assessment was performed to the requirements of iec 61508. The result of the functional safety assessment can be summarized by the following statements. Knowledge is such a treasure which cannot be stolen. Xilinx reduces risk and increases efficiency for iec61508. There is no notion of accident as a harmful event in iec 61508, but rather hazardous event. The phrase electricalelectronicprogrammable electronic is cumbersome and is often shortened to eepe, which some pronounce eeeepeeee and others such as myself eepee. The functional safety standards iec 61508 and iec 61511 recognise that there is always some degree of uncertainty in the assumptions made in calculation of failure rate and probability.
The principles of the standard can also be extended to assess mechanical elements if they are used in the safety function. The two standards define a specific safety life cycle for the whole design process. Sp and hic2821 hic2822 with the technical iec 61508 2. Iec 61508 3 pdf iec is an international standard published by the international electrotechnical commission consisting of methods on how to apply, design, deploy and. This standard started in the mid 1980s when the international electrotechnical committee advisory committee of safety iec acos set up a.
Premium segment passenger vehicles are equipped with a vast number of control units to deliver. A basic guide may 2004 safety requirements concept, scope definition, hazard analysis and risk assessment. References weight kglb type xpsuep for extending the number of safety contacts 24. Results of the iec 61508 functional safety assessment. The idea is to identify the hazards hazardous situations, then assess the risks they represent. Iec standards help build trust in emerging and cuttingedge technologies which will have a huge impact on our daily lives. The audited company development process tailored and implemented by the 9202 pulse isolator software and hardware development project, complies with the relevant safety management requirements of iec 61508 sil2. Safety instrumented systems sis, safety integrity levels. It addresses those parts of a device or system that perform automated safety functions including, for example, sensors, control logic, actuators and microprocessors. Safety relevant temperature measurement per iec 61508 introduction under certain conditions, electrical thermometers can be used in a safety related system in accordance with iec 61508.
For this reason the standards specify a minimum level of fault tolerance i. Iec 61508 assessment exida functional safety services. Iso 26262 is an automotive interpretation of the generic functional safety standard iec 61508 1. The international electrotechnical commission is the organisation which develops and sets international standards in electrotechnical engineering areas. Functional safety of electrical electronicprogrammable electronic safetyrelated systems. Guidelines on the application of lec 61508 2 and i ec 61508 3 corresponding indian standard is iec 61508 2. Applying the latest standard for functional safety iec 61511. To achieve a product certification, it is required that specific design details, the safety. The iec 61508 series provides functional safety standards for the lifecycle of electrical, electronic or programmable electronic eepe systems and products. The version of the electrical thermometer as resistance thermometer or thermocouple as well as the. However, the separate redline document is only available in english. Functional safety of electricalelectronic programmable electronic safetyrelated systems.
820 108 1175 1475 1641 68 1445 1136 1390 1200 752 720 427 1749 1087 1791 476 1627 976 883 577 1724 523 1521 406 895 851 287 1048 1786 1842 1292 1795 1750 454 467 30