By David J Smith BSc PhD CEng FIEE FIQA HonFSaRS MIGasE.

Electrical, digital and programmable digital platforms more and more perform safeguard features to protect staff and the general public opposed to harm or dying and the surroundings opposed to toxins. The foreign sensible safeguard average IEC 61508 was once revised in 2010, and this can be the 1st finished consultant to be had to the revised average.

As practical protection is appropriate to many industries, this booklet could have a large readership past the chemical and technique quarter, together with oil and gasoline, energy new release, nuclear, airplane, and car industries, plus venture, instrumentation, layout, and keep an eye on engineers.

  • The purely complete advisor to IEC 61508, up-to-date to hide the 2010 amendments, that may make certain engineers are compliant with the most recent method safeguard platforms layout and operation standards
  • Helps readers comprehend the method required to use protection severe platforms standards
  • Real-world process is helping clients to interpret the regular, with case experiences and top perform layout examples throughout
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Additional info for Safety Critical Systems Handbook: A STRAIGHTFOWARD GUIDE TO FUNCTIONAL SAFETY, IEC 61508

Sample text

The evidence for each item would then be entered in the right hand column as in the simple tables below. However, the following tables might be considered adequate for relatively straightforward designs. g. spec, test report, review, calculation) which satisfies that requirement.

The Tables provide the maximum SIL which can be claimed for each safe failure fraction case. The expression “mþ1” implies redundancy whereby there are (mþ1) elements and m failures are sufficient to cause system failure. The term Hardware Fault Tolerance is commonly used. e. no failures tolerated). e. 1 failure tolerated) and so on. Meeting IEC 61508 Part 2 53 Requirements for Safe Failure fraction Type A SFF SIL for Simplex HFT 0 SIL for (mD1) HFT 1 SIL for (mD2) HFT 2 <60% 1 2 3 60%-90% 2 3 4 90%-99% 3 4 4 >99% 3 4 4 Type B SFF SIL for Simplex HFT 0 SIL for (mD1) HFT 1 SIL for (mD2) HFT 2 <60% NO 1 2 60%-90% 1 2 3 90%-99% 2 3 4 >99% 3 4 4 * Simplex implies no redundancy (mþ1) implies 1 out of 2, 2 out of 3 etc (mþ2) implies 1 out of 3, 2 out of 4 etc *This configuration is not allowed.

10003-3 Copyright Ó 2011 Dr David J Smith and Kenneth G L Simpson. Published by Elsevier Ltd. All rights of reproduction in any form reserved 45 56 46 Chapter 3 IEC 61508 Part 2 covers the safety system hardware and overall system design, whereas software design is covered by Part 3 (see next Chapter). This chapter summarizes the main requirements. However, the following points should be noted first. g. high medium low), represents the opinions of individuals involved in drafting the Standard. g.

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