DOCSLIB.ORG

Opensafety – the Key to Your Safety Solution

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Opensafety – the Key to Your Safety Solution April 2010 / Issue 1 The Magazine for the Industrial Ethernet Standard Volume 5, Volume FACTS openSAFETY – the key to your safety solution openSAFETY: the first open and bus-independent safety standard for all Industrial Ethernet solutions Save time and expenses: how everyone benefits from openSAFETY openSAFETY over SERCOS III, EtherNet/IP, Modbus-TCP, POWERLINK, and your fieldbus www.open-safety.org 2 Special 1/2010 openSAFETY: the first open and bus- independent safety standard for all Industrial Ethernet solutions The data transfer protocol that carries safety frame traffic has no bearing at Highlights at a glance: all on the functionality of the safety protocol. This is called the Black Chan- nn one single, uniform standard for all leading fieldbuses nel principle: all safety-oriented mech- nn maximum productivity due to efficient cross- a­­nisms are exclusively implemented on communication the application level, which enables total independence from the underlying nn reduced commissioning and maintenance time transport layer. A brief look at the basic nn automatic safe parameterization structure of data transfer protocols may serve to illustrate the principle. nn perfectly suited to safe modular machine concepts nn sole 100% open safety solution nn Transport and Application Layers nn fastest IEC 61508 SIL3 communication solution nn no risk involved in investment: TÜV certified The standardized OSI (“Open Systems conformance test Interconnection”) data communication model is the reference scheme for nn perfectly suited to back-plane buses today’s most common non-proprietary data transfer protocols. This system is comprised of seven layers that enable the processing of data in a hierarchically With openSAFETY, the EpSG has intro- communication solutions. The EpSG structured way. Every layer represents duced the world’s first 100% open provides active support for imple- a stage determined by protocols in safety protocol. In fact, openSAFETY menting openSAFETY on top of any and which data transfer tasks are carried is open not only in terms of its legal all data transfer protocols, and also out according to specific rules. The basis, but also literally open in techni- offers help e.g. for certification and two fundamental, low-level layers are cal respects: given the protocol’s bus- conformance tests. The open source the so-called physical layer and the independence, openSAFETY can be license of this TÜV-certified protocol Data link layer, which are also jointly used with all fieldbuses, Industrial stack ensures that the technology is a referred to as physical layers. These Ethernet solutions, or industry-specific very secured investment for all users. layers define the physical interface to Choose your certification authority: IEC 61508 certification by TÜV Rheinland and TÜV Süd Special 3 Das Magazin zum Standard FACTS im Industrial Ethernet All logos are registed trademarks of the corresponding vendor organization. They solely represent the associated technology and the related possible application. openSAFETY is independent from every fieldbus association. the transmission medium, and provide a format that higher-level applications anisms implemented in this layer test functions to check whether an can digest, and ensures syntactically enable safety-oriented decoding and actual connection between a sending correct data exchange. Other tasks encoding of payload data pertaining to and a receiving device is established carried out in the presentation layer specific safety-sensitive applications. at all. Ethernet only specifies these two include data compression and data For the sake of simplicity, the blue area low-level physical layers. Also referred encryption. The top layer in the OSI in the center of this illustration covers to as “transfer layers,” the third and model is the Application layer. For this all the transport-oriented layers 2 fourth layer handle the timing and layer, no strict definition of a task or through 6. The choice of transport logical order of data transfer as well as range of tasks is applicable. It provides medium, or, more precisely, of a specific data attribution to applications. Com- various services to actual applications data transfer protocol, is of marginal prising all transport-oriented services, that operate outside the scope of this importance. these four layers combined can be said model. Inspired by the OSI model, to constitute no more than the traffic the illustration below highlights that medium for application data, which, in openSAFETY exclusively specifies the the OSI model, is attributed to the upper high-level, application-oriented layers layers. These high-level layers include of the protocol stack. The safety mech- the Session layer and presentation layer. These two are often grouped with the Application layer, since all programs and applications directly access all three of them. The Session Inspired by the OSI model, layer administers the organization and layer 7 Your Application this schematic view of synchronization of data exchange be- openSAFETY’s general tween applications. E.g. if a connection implementation illustrates layer 6 is interrupted, services on this layer that the open safety protocol ensure that communication is resumed CAN Modbus EtherNet/Ip exclusively specifies the from the point of interruption once the layer 5 appli cation-oriented layer – connection is back in operation. layer the basic prerequisite to enable 6, the presentation layer, translates EtherCAT Your Fieldbus Black Channel operation. system-specific representations into layer 4 profinet layer 3 pOWERlINK Sercos Wireless layer 2 layer 1 Ethernet RS485CAN USB … lVDS 4 Special 1/2010 Save time and expenses: how everyone benefits from openSAFETY “Competition is good for business” – nn Rising development potential was sizable. The entry of this free market maxim is almost costs for communication Ether net technology into industrial data always true, since healthy competition systems communications marked the next stage stimulates continual product improve- of development, one that was widely ments regarding quality as well as cost- A brief review of the history of bus-based associated with the expectation that, effectiveness. However, safety-oriented automation may serve to illustrate how finally, a universal standard would software and hardware development is investment risk has been increasing in prevail. However, as different manu- a special case where this rule may not line with growing complexity. Ten years facturers chose strongly divergent apply, because manufacturers in a after the introduction of the first field- approaches to enable real-time per- market economy are faced with a high bus, the market was full of different, form ance with this techno logy, what investment risk: there are considerable competing systems. Infighting over followed was the fieldbus war all over development costs, but there is only the standardization of the technology again. Amongst a multitude of systems, comparatively small sales potential. ensued. Until the present day, industry about half a dozen have been able to Hence, the automation sector has long experts know this phase as the “field- claim major portions of the market: been calling for a universal safety bus war,“ which only seemed to end profinet, Modbus-TCp, EtherNet/Ip, protocol, i.e. one that would give all with the introduction of the IEC61158 – which all provide soft real-time per form­­­ manufacturers a solid economic base a weak compromise because still, even ance, and the hard real-time systems for all further development of safety- this conclusion do not bring any overall pOWERlINK, EtherCAT, and SERCOS III. oriented products. The introduction system compatibility. Still, even this There was a moderate increase of de- of openSAFETY marks the first time a conclusion did not bring about overall vel­­­opment costs for In dus trial Ethernet standard of this kind has become system compatibility. It should be solutions in comparison to conventional available that can be used license noted, though, that development costs fieldbuses. At the same time, the sales free by anyone. for first generation buses were com- potential could not be increased in the paratively low, whereas their market same proportion. Development effort Integrated safety technology Industrial Ethernet These graphs visualize how Fieldbuses investment risk increases as development becomes more and more complex. Sales potential Special 5 Das Magazin zum Standard FACTS im Industrial Ethernet Save time and expenses: how everyone benefits Plant automation “one safety standard for your entire production plant” from openSAFETY openSAFETY constitutes a universal safety standard for an entire production line, irrespective of the control system manufacturer and fieldbus standard used in it. plC Supplier 1 plC Supplier 2 plC Supplier 3 plC Supplier 4 The bus-independent openSAFETY standard therefore reduces costs as well as commissioning time for production facilities as a whole. Machine 1 Machine 2 Machine 3 Machine 4 nn Safety technology – nn The solution: a special case openSAFETY Benefits for plant operators Things look markedly different, however, A tried and tested, non-proprietary sys- for the development and certification tem, openSAFETY resolves this situation nn a single, consistent safety standard for an entire effort required to make products de- in a way that benefits both manufactur- line or plant signed for use in safety-sensitive areas, ers and users. Thanks to the Black
Load more

Recommended publications
  • Introduction to Real-Time Ethernet II
    the EXTENSION JULY–AUGUST A Technical Supplement to Control Network Volume 5 Issue 4 © 2004 Contemporary Control Systems, Inc. Introduction to Real-Time Ethernet II By Paula Doyle, a doctoral researcher with the Circuits and Systems Research Centre at the University of Limerick in Ireland INTRODUCTION IEEE 1588 defines two separate types of clocks: In “Real-Time Ethernet I”, we introduced the basic ordinary and boundary. Boundary clocks (BC) are concepts of Ethernet’s capacity to deliver a real-time employed in devices such as hubs or switches—where (RT) communication system. “Real-Time Ethernet II” more than one PTP communication path (port) exists. introduces some of the RT solutions available to Ordinary clocks exist in devices having a single port— e.g., normal network devices. Each BC port can act as industry today*: PROFInet, EtherCAT and ETHERNET Powerlink. It also provides an introduction to a single a master or ordinary clock in its own segment. standard, IEEE 1588 that is growing in popularity PTP is for networks that support multicasting but amongst RT Ethernet developers to provide sub- keep multicasts within a subnet and where each local microsecond synchronization accuracy of distributed clock fulfills exacting requirements. The grandmaster clocks over Ethernet. clock (GMC) is the best clock in the system—with the best inherent stability, accuracy, resolution, etc. * EtherNet/IP is included in the full article available at defined by the standard [2]. The Best Master Clock http://www.ccontrols.com/pdf/volume5n4.pdf Algorithm (BMC), run by every live node, determines IEEE 1588 clock quality. Within each subnet, the BMC determines the master clock; in a single-subnet system the master IEEE 1588 [1] specifies “A protocol to synchronize is the GMC.
    [Show full text]
  • Xilinx Ethernet POWERLINK Solution Sell Sheet
    Xilinx Ethernet POWERLINK Xilinx Ethernet POWERLINK Solution: Synchronizing High-Performance Control Systems The Challenges to Industrial Ethernet POWERLINK is an open, software-based Real Time Communication Network Design protocol compatible with standard Ethernet hardware. Both the Controlled Nodes (slaves) and the Managing Nodes (masters) can be built on standard Ethernet • Provide high performance, cost- components for 100 Mbits/s Ethernet. effective Ethernet-based communication technology for control applications Designed For Ultimate Flexibility POWERLINK's flexibility results is standardization, ease of service and maintenance • Integrate design changes to meet and reduced implementation and operating costs. POWERLINK is ideal for future specifications synchronization of high performance motion control systems. The POWERLINK IP developed by port GmbH adheres to Ethernet POWERLINK protocol. Its four variants • Bridge between multiple interface are designed for ultimate flexibility on Xilinx FPGAs. protocols and support various protocol technologies with a common hardware Integrates with All Standard Ethernet Protocols design POWERLINK can be implemented using any standard Ethernet hardware. While supporting all topologies, it offers complete operational conformance between systems that adhere to Ethernet communication systems. The Xilinx Ethernet POWERLINK Solution Performance Now and in the Long-Term POWERLINK meets the highest requirements of hard Real Time performance • Provide hardware necessary to achieve and determinism. POWERLINK is poised to support transmission rates 10x higher best Real Time behavior, short delays (1000 Mbits/s) than today with Gigabit Ethernet ported to FPGAs. and fast response times POWERLINKsafety and Security • Implement multiple design variants in POWERLINKsafety is an open real time safety protocol developed by Ethernet the FPGA POWERLINK Standardization Group (EPSG).
    [Show full text]
  • Evaluation of Open Source Operating Systems for Safety-Critical Applications Master’S Thesis in Embedded Electronic System Design
    Evaluation of open source operating systems for safety-critical applications Master’s thesis in Embedded Electronic System Design Petter Sainio Berntsson Department of Computer Science and Engineering CHALMERS UNIVERSITY OF TECHNOLOGY UNIVERSITY OF GOTHENBURG Gothenburg, Sweden 2017 MASTER’S THESIS 2017 Evaluation of open source operating systems for Safety-critical applications Petter Sainio Berntsson Department of Computer Science and Engineering Chalmers University of Technology University of Gothenburg Gothenburg, Sweden 2017 Evaluation of open source operating systems for safety-critical applications Petter Sainio Berntsson © Petter Sainio Berntsson, 2017 Examiner: Per Larsson-Edefors Chalmers University of Technology Department of Computer Science and Engineering Academic supervisor: Jan Jonsson Chalmers University of Technology Department of Computer Science and Engineering Industrial supervisors: Lars Strandén RISE Research Institutes of Sweden Dependable Systems Fredrik Warg RISE Research Institutes of Sweden Dependable Systems Master’s Thesis 2017 Department of Computer Science and Engineering Chalmers University of Technology University of Gothenburg SE-412 96 Gothenburg Telephone +46(0) 31 772 1000 Abstract Today many embedded applications will have to handle multitasking with real-time time constraints and the solution for handling multitasking is to use a real-time operating system for scheduling and managing the real-time tasks. There are many different open source real-time operating systems available and the use of open source software for safety-critical applications is considered highly interesting by industries such as medical, aerospace and automotive as it enables a shorter time to market and lower development costs. If one would like to use open source software in a safety-critical context one would have to provide evidence that the software being used fulfills the requirement put forth by the industry specific standard for functional safety, such as the ISO 26262 standard for the automotive industry.
    [Show full text]
  • The Future of CAN / Canopen and the Industrial Ethernet Challenge by Wilfried Voss, President Esd Electronics, Inc USA
    The Future of CAN / CANopen and the Industrial Ethernet Challenge by Wilfried Voss, President esd electronics, Inc USA Industrial Ethernet technologies are a formidable challenge to CANopen as the low-cost industrial networking technology of choice. Ethernet technologies will eventually replace the majority of CANopen applications, at least in regards to new developments. For many years, Controller Area Network (CAN) and CANopen, a higher-layer protocol based on CAN, represented the best choice for low-cost industrial embedded networking. However, since the official introduction of CAN in 1986, there has been a quest to replace CAN and CANopen to overcome the most obvious shortcomings such as limited baud rate and limited network length. Industrial Ethernet technologies are currently the most formidable challenge to CANopen as the low-cost industrial networking technology of choice. Ethernet technologies will eventually replace the majority of CANopen applications, at least in regards to new developments, starting at this very moment in certain areas such as industrial control including motion control and, especially, robotics. Ironically, CAN - the underlying hardware layer of CANopen - has a far greater lifetime expectancy in the North American market than CANopen as a higher layer protocol. However, there can be too much of a good thing, and that is definitely the case when it comes to Ethernet-based fieldbus technologies. There are currently more than 20 different industrial Ethernet solutions available, all with their distinctive advantages and disadvantages, making a pro/contra decision difficult. The major question, besides the technical aspect, is which of these technologies will survive in the market, and how do they support the current need for control components.
    [Show full text]
  • Study on Real‑Time Industrial Control Networks
    This document is downloaded from DR‑NTU (https://dr.ntu.edu.sg) Nanyang Technological University, Singapore. Study on real‑time industrial control networks Wu, Xuepei 2019 Wu, X. (2019). Study on real‑time industrial control networks. Doctoral thesis, Nanyang Technological University, Singapore. https://hdl.handle.net/10356/90139 https://doi.org/10.32657/10220/48429 Downloaded on 11 Oct 2021 09:28:10 SGT Acknowledgments Undertaking doctoral study has been a truly life-changing experience for me and it would never have been possible to take this work to completion without the guidance and support that I received from many people. Firstly, I would like to express my sincere appreciation and respect to my supervisor, Professor Xie Lihua, for his professional guidance and valuable suggestions throughout my time as his student. I could not imagine having had a better advisor and mentor for my research work. I owe the deepest gratitude to my family for their encouragement and love. My wife and my parents have been extremely supportive of me throughout the entire study and have made countless sacrifices to help me get to this point. I also thank the staff and students in the Internet of Things Laboratory of Nanyang Technological University for their help. Lastly, I gratefully acknowledge the funding received from the Industrial Postgraduate Programme of the Singapore Economic Development Board (grant number S11-1669- IPP). i Abstract Boosted by business trends such as Industry 4.0, Industrial Internet of Things (IIoT) solutions such as real-time Ethernet and wireless technologies have been increasingly de- ployed in the industrial automation sector.
    [Show full text]
  • Industrial Ethernet Technologies Page 1 © Ethercat Technology Group, January 2011
    Industrial Ethernet Technologies Page 1 © EtherCAT Technology Group, January 2011 Industrial Ethernet Technologies: Overview Approaches Modbus/TCP Ethernet/IP Powerlink PROFINET SERCOS III EtherCAT Summary © EtherCAT Technology Group Industrial Ethernet Technologies Editorial Preface: This presentation intends to provide an overview over the most important Industrial Ethernet Technologies. Based on published material it shows the technical principles of the various approaches and tries to put these into perspective. The content given represents my best knowledge of the systems introduced. Since the company I work for is member of all relevant fieldbus organizations and supports all important open fieldbus and Ethernet standards, you can assume a certain level of background information, too. The slides were shown on ETG Industrial Ethernet Seminar Series in Europe, Asia and North America as well as on several other occasions, altogether attended by several thousand people. Among those were project engineers and developers that have implemented and/or applied Industrial Ethernet technologies as well as key representatives of some of the supporting vendor organizations. All of them have been encouraged and invited to provide feedback in case they disagree with statements given or have better, newer or more precise information about the systems introduced. All the feedback received so far was included in the slides. You are invited to do the same: provide feedback and – if necessary – correction. Please help to serve the purpose of this slide set: a fair and technology driven comparison of Industrial Ethernet Technologies. Nuremberg, January 2011 Martin Rostan, [email protected] Industrial Ethernet Technologies Page 2 © EtherCAT Technology Group, January 2011 Industrial Ethernet Technologies: Overview Approaches Modbus/TCP Ethernet/IP Powerlink PROFINET SERCOS III EtherCAT Summary © EtherCAT Technology Group Industrial Ethernet Technologies All Industrial Ethernet Technologies introduced in this presentation are supported by user and vendor organizations.
    [Show full text]
  • ETHERNET Powerlink Real-Time Industrial ETHERNET Servo Drives & Controllers
    aerospace climate control electromechanical filtration fluid & gas handling hydraulics pneumatics process control sealing & shielding ETHERNET Powerlink Real-Time Industrial ETHERNET Servo Drives & Controllers Parker Hannifin Corporation • Electromechanical Automation Division • 800-358-9070 • www.parkermotion.com 1 ETHERNET Powerlink MotionBus Systems from the Global Leader in Motion Control Parker understands the challenges facing OEMs in high- tech industries. To help meet their challenges, Parker’s team of highly experienced motion system designers use a systematic project management process to deliver the most advanced linear motion technologies available. For all industrial automation solutions, Parker Automation combines speed, accuracy and high-load capability to give machine builders and OEMs a competitive edge. Medical device manufacturers Parker is the only supplier that utilize Parker’s integrated can provide complete technical automation solutions specifically and engineered solutions designed to reduce time-to- to OEMs for any packaging market and engineering costs requirement. Parker’s innovative while improving compliance with engineering, breadth of line, today’s stringent government worldwide distribution, and regulations. outstanding customer service set the standard for the industrial For semiconductor manufacturers, motion market in all these areas: our extensive expertise in vacuum preparation, cleanroom • Application analysis facilities and large-format • Engineering assistance systems enable us to design and •
    [Show full text]
  • Industrial Ethernet Facts Compares PROFINET (RT, IRT), POWERLINK, Ethernet/IP, Ethercat, and SERCOS III, I.E
    Luca Lachello Wratil Peter Anton Meindl Stefan Schönegger Singh Karunakaran Bhagath Huazhen Song Stéphane Potier Preface Outsiders are not alone in finding the world of Industrial Ethernet somewhat confusing. Experts who examine the matter are similarly puzzled by a broad and intransparent line-up of competing systems. Most manufacturers provide very little information of that rare sort that captures techni- cal characteristics and specific functionalities of a certain standard in a way that is both com- prehensive and easy to comprehend. Users will find themselves even more out of luck if they are seeking material that clearly compares major systems to facilitate an objective assessment. We too have seen repeated inquiries asking for a general overview of the major systems and wondering “where the differences actually lie”. We have therefore decided to dedicate an issue of the Industrial Ethernet Facts to this very topic. In creating this, we have tried to remain as objective as a player in this market can be. Our roundup focuses on technical and economic as well as on strategic criteria, all of which are relevant for a consideration of the long-term via- bility of investments in Industrial Ethernet equipment. The arguments made in this publication were advanced and substantiated in numerous conversations and discussions with developers and decision-makers in this field. We have made every attempt to verify claims whenever practically possible. This document must not be modified Despite all our efforts, though, we were unable to ascertain exact, verifiable information on without prior consent of its publisher. some aspects, which prompts us to ask for your help: if you would like to propose any Passing on the document in its entirety amendments or corrections, please send us an e-mail or simply give us a call.
    [Show full text]
  • Opensafety Basics 2013
    openSAFETY The open safety standard for all communication protocols What does Safety normally look like? • Safety Relays within the cabinet • Safety application by discrete wiring PLC I/O Servo Safety Relays What does Safety normally look like? • Safety Relays within the cabinet • Safety application by discrete wiring PLC I/O Servo Additional DI/DO module Safety Relays What does Safety normally look like? • Safety Relays within the cabinet • Safety application by discrete wiring PLC I/O Servo Additional DI/DO module Extra wiring of safe sensors Safety Relays What does Safety normally look like? • Safety Relays within the cabinet • Safety application by discrete wiring PLC I/O Servo Additional DI/DO module Extra wiring of safe sensors Safety Extra wiring required to Relays control safe actuators What does Safety normally look like? • Safety Relays within the cabinet • Safety application by discrete wiring PLC I/O Servo Additional DI/DO module Speed Monitor Extra wiring of safe sensors Safety Extra wiring required to Relays control safe actuators Extra speed monitor for safe motion control functions What does Safety normally look like? • Safety Relays within the cabinet • Safety application by discrete wiring PLC I/O Servo Additional DI/DO module Speed Monitor Extra wiring of safe sensors Safety Timer Extra wiring required to Relays Relays control safe actuators Extra speed monitor for safe motion control functions Timer Relays for synchronous shutdown What Safety should look like! • Integrated • Flexible PLC
    [Show full text]
  • Basics Why Real-Time Industrial Ethernet?
    System Overview POWERLINK Basics Why Real-time Industrial Ethernet? Over the course of the last two decades, it has combination with an Internet protocol like TCP/IP is become hard to keep track of the numerous field- unsuitable for data transmission in hard real-time. bus systems that have been developed in the auto- Data traffic can be delayed in unforeseeable ways mation industry specifically for purposes of process due to the CSMA/CD mechanism (Carrier Sense and factory production control. Yet there remain Multiple Access/Collision Detection). An integral various restraints that are impeding their perform- part of the Ethernet standard IEEE 802.3, that ance. Demand has therefore become more mechanism helps prevent data collisions on the pressing for a reliable communication system that bus that can occur in Ethernet environments due would offer high flexibility and across-the-board to the particular nature of Ethernet transmissions. compatibility. A new solution in this vein was also In order to develop Ethernet-based, but real-time expected to allow for ongoing improvements and capable fieldbuses, manufacturers have pursued future upgrades. Ethernet first rose to that chal- various approaches in their efforts to eliminate such lenge: it was a tried and tested technology that delays. These solutions are commonly referred to as was free of patents and was widely standardized. “Real-time Industrial Ethernet” technologies. This Moreover, it had great potential to serve as a booklet will introduce you to POWERLINK, which consistent, integrated communication solution, i.e. has become one of the most successful Real-time allow for an interconnection of the control, process, Industrial Ethernet systems in the world today.
    [Show full text]
  • Relevant Norms and Standards
    Appendix A Relevant norms and standards A.1 A Short Overview of the Most Relevant Process Standards There is a huge number of different process standards, and Fig. A.1 contains an overview of the most relevant such standards as covered in this book, showing the topics covered. A more extensive list of the relevant standards will be provided in the following section below. ISO/IEC 15504, ISO 19011 ISO/IEC 330xx Auditing man- agement systems Process Process assessment ISO/IEC 20000-1 ISO 9001 ISO/IEC 15504-6 ISO/IEC 15504-5 Service management QM system re- System life cycle PAM Software life cycle PAM Assessments, audits Criteria system requirements quirements ISO/IEC/IEEE 15288 ISO/IEC/IEEE 12207 ITIL System life cy- Software life cy- IT Infrastruc- cle processes cle processes ture Library COBIT Life cycle processes SWEBoK Software engineering Funda- Body of Knowledge mentals ISO/IEC/IEEE 24765 ISO 9000 Systems and SW Engineering Vocabulary QM fundamentals (SEVOCAB) and vocabulary Vocabulary Systems Software Organzational IT Quality Management Engineering Engineering Fig. A.1 Overview of the most important standards for software processes © Springer Nature Switzerland AG 2018 327 R. Kneuper, Software Processes and Life Cycle Models, https://doi.org/10.1007/978-3-319-98845-0 328 A Relevant norms and standards A.2 ISO and IEC Standards The International Organization for Standardization (ISO) is the main international standard-setting organisation, working with representatives from many national standard-setting organisations. Standards referring to electrical, electronic and re- lated technologies, including software, are often published jointly with its sister organisation, the International Electrotechnical Commission (IEC), but IEC also publishes a number of standards on their own.
    [Show full text]
  • IEC 61508 Standard for Functional Safety of Electrical/Electronic/Programmable Electronic Safety-Related Systems
    IEC 61508 Overview Report A Summary of the IEC 61508 Standard for Functional Safety of Electrical/Electronic/Programmable Electronic Safety-Related Systems exida Sellersville, PA 18960, USA +1-215-453-1720 © exida IEC 61508 Overview Report, Version 2.0, January 2, 2006 Page 1 of 29 1 Overall Document Summary IEC 61508 is an international standard for the “functional safety” of electrical, electronic, and programmable electronic equipment. This standard started in the mid 1980s when the International Electrotechnical Committee Advisory Committee of Safety (IEC ACOS) set up a task force to consider standardization issues raised by the use of programmable electronic systems (PES). At that time, many regulatory bodies forbade the use of any software-based equipment in safety critical applications. Work began within IEC SC65A/Working Group 10 on a standard for PES used in safety-related systems. This group merged with Working Group 9 where a standard on software safety was in progress. The combined group treated safety as a system issue. The total IEC 61508 standard is divided into seven parts. Part 1: General requirements (required for compliance); Part 2: Requirements for electrical/electronic/programmable electronic safety-related systems (required for compliance); Part 3: Software requirements (required for compliance); Part 4: Definitions and abbreviations (supporting information) Part 5: Examples of methods for the determination of safety integrity levels (supporting information) Part 6: Guidelines on the application of parts 2 and 3 (supporting information) Part 7: Overview of techniques and measures (supporting information). Parts 1, 3, 4, and 5 were approved in 1998. Parts 2, 6, and 7 were approved in February 2000.
    [Show full text]