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Entries tagged with: IEC 61508

2012 - Good Progress for Cybersecurity and Functional Safety

I think it is wise for individuals to periodically review things. I like to do my professional review at the end of the year. 2012 was a good year.

Product Certification

Over 60 new products received functional safety or cybersecurity certification this year. Those products and more…

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  • by Dave Butler, CFSE
  • Tuesday, June 25, 2013
  • Software

Allocation vs. Derivation

Please see the first entry of the Requirements Management blog series here.

The concepts of allocation and derivation are sometimes misunderstood when it comes to requirements management.  This can lead to confusion and even to safety problems.  The process of derivation involves the writing of a new requirement, …

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Are All Field Devices Type A?

Are All Field Devices Type A?

I was told by an end user engineer that he considers all field devices to be simple Type A devices.  In IEC 61508, Type A is defined as a device with well-defined failure modes, well known failure rates, and behavior under fault conditions that can be completely determined.  Type…

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Are You Building a Safer World?

Are You Building a Safer World?

Every man takes care that his neighbor shall not cheat him. But a day comes when he begins to care that he does not cheat his neighbor. Then all goes well.”  - Ralph Waldo Emerson

I like to think about functional safety in a similar way.  We all want…

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  • by John Yozallinas, CFSE
  • Thursday, August 16, 2012
  • Certification

Are You Going for Gold in Safety?

Olympic athletes don’t wake up one day and decide to compete in the Olympics.  They don’t arrive at the games by chance or coincidence.  Their journey starts long before the games begin. They are often influenced and inspired by watching others or by their own interests.  They may begin…

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Building a Foundation for an IEC 61508 Development Process

Building a Foundation for an IEC 61508 Development Process

There are organizations that are small enough to follow an informal or even undocumented process and still produce a product of sufficient quality to meet market needs.  When these organizations attempt to develop a safety product, they inevitably fall short of meeting the requirements of IEC 61508.  A formalized…

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  • by Dr. William Goble, CFSE
  • Thursday, May 12, 2011
  • Certification

Buy Certified Equipment, Meet the Standard, Right? WRONG!

  • by Dr. William Goble, CFSE
  • Thursday, May 09, 2013
  • Certification

Certificate Forgery!

exida has discovered yet another forged functional safety certificate.  You can read about another occurrence in a previous blog entry.

False Certificate


The company name on the forged certificate is ISP SA DE CV, Cunduacan, Tab., Mex.  How could someone…

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Certification and the Environmental Test
  • by John Yozallinas, CFSE
  • Tuesday, August 18, 2015
  • Certification

Certification and the Environmental Test

Functional Safety Assessments (FSA) focus on the relevant functional safety standards that are to be applied to a product in the appropriate industry.  These are standards such as IEC 61511 in the process automation industry, or ISO 26262 in the automotive industry.  And IEC 61508 is like an umbrella…

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Certified to SIL 4 - Cycle Test Failure Data is Dangerous

I got a copy of the IEC 61508 certificate for a solenoid valve today from an engineer who thought something was wrong.  Although the certificate was from a well known certification company, the certificate gave a “Dangerous Failure Rate” of 1.7 FITS (1.7 * 10-9 failures per…

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CFSE/CFSP: Why and How to Become One

 

As an engineer responsible for critical industrial processes, we face a variety of challenges:

  • coping with new and changing standards
  • increased pressures for process uptime and plant safety
  • a growing list of responsibilities
  • decreased availability of support personnel

This makes…

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  • by Iwan van Beurden, CFSE
  • Thursday, March 21, 2013
  • Software

Changing the PVST Interval. Hey, my Architectural Constraints changed!

Comparing the IEC 62443 Software Engineering Process to IEC 61508: Where Do They Overlap?

Comparing the IEC 62443 Software Engineering Process to IEC 61508: Where Do They Overlap?

With the appearance of malware and nation state attacks on Industrial Control Systems (ICS), such as the Stuxnet (2010), Industroyer (2016) and TRITON (2017) attacks, the IEC 62433 standards are gaining wider attention.  

While the potential targets to attack in an ICS system are many-fold, one plant asset that…

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  • by Dr. William Goble, CFSE
  • Tuesday, March 08, 2011
  • Certification

Counterfeit Certificate!

I am told that plagiarism is a compliment. Since exida is the leading company for IEC 61508 certifications I suppose it was bound to happen. Well it did. exida got an email from our sales representative in China. He asked why this certificate was not listed on the…

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  • by John Yozallinas, CFSE
  • Thursday, December 12, 2013
  • Certification

Developing a Functional Safety Product: What You Need to Know

Thinking about developing a safety product?  Use these 3 steps as a starting point:

1. Know thyself

Do you have documented development processes that govern how you develop a product from start to finish?  If not, start by writing down what is actually being done.  Interview the people…

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Do you know your Site Safety Index?
  • by John Yozallinas, CFSE
  • Thursday, August 02, 2018
  • Certification

Do you know your Site Safety Index?

There’s a lot that exida does behind the scenes to advance the industry and benefit you. We try to make sense of data that we collect and put it to good use. One thing we found is that human activities play a role in functional safety, often causing the intended safety performance…

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Dreaming of a Better Tomorrow?

Dreaming of a Better Tomorrow?

When I was a kid, I liked watching the Jetsons.  I felt certain that by the year 2000 we’d all be enjoying those flying saucers and futuristic homes.  Imagine my disappointment that in 2018 we still drive on 4 wheels… and my home cannot elevate itself above bad weather……

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  • by schweitzer engineering laboratories
  • Tuesday, May 30, 2017
  • Software

Elektrobit Automotive EB tresos® Safety OS 2.x for TriCore TC29xT

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Fake Fact: Final Elements should not be included in SIF evaluation

Fake Fact: Final Elements should not be included in SIF evaluation

Ehh… If your safety action is stopping flow/closing a valve, how are you going to accomplish this if you consider that the remote actuated valve is not part of your SIF ?

So, what is this myth based on? The title of IEC 61508 reads “Functional safety of electrical/electronic/programmable…

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Fake Fact: IEC 61508 Does Not Affect Me As an End User

Fake Fact: IEC 61508 Does Not Affect Me As an End User

Though this is largely true, I want to discourage people from completely ignoring the good things that IEC 61508 does for the end user.

IEC 61511 is the process industry functional safety standard derived from IEC 61508. In the very first section of IEC 61511 (“Scope”), the standard describes…

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