exida explains Blog

Guest Blog: Thar’s Gold in Them Thar Failure Data

Guest Blog: Thar’s Gold in Them Thar Failure Data

Failure data collection can seem tedious, time consuming and expensive.  Just figuring out what data to collect can be challenging.  Failure data analysis can be overwhelming with a sense of “I don’t even know where to begin.”  So it is not surprising that these useful, vital activities are often neglected especially when…

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Why Does My Risk Assessment Require an FMEDA?

Why Does My Risk Assessment Require an FMEDA?

If you find yourself faced with this question you might be wondering why it is that having successfully used risk assessments without FMEDA your team are suddenly faced with the complexity of executing FMEDAs.

Maybe us safety people answer with a follow…

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Personnel Certification Concerns? We are Here to Help.
  • by Ted Stewart, CFSP, exidaCSP
  • Tuesday, September 17, 2019
  • Certification

Personnel Certification Concerns? We are Here to Help.

A few weeks ago, we were asked to help a fellow colleague who received a message regarding their FS Engineer (TÜV Rheinland) certificate :

We are aware, that the validity of your FS Expert (TÜV Rheinland) certificate is expiring this month. Kindly be informed that we have had a…

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Back to Basics 12 –  What is IEC 61508 Certification?

Back to Basics 12 –  What is IEC 61508 Certification?

IEC 61508 Certification is a Third-Party Validation against the standard’s requirements, comprising of:

  • Detailed Analysis of engineering processes to determine Systematic Capability and Cybersecurity Strength 
  • Detailed Analysis of hardware design / design margins resulting in Random Failure Rate in all failure modes
  • Analysis/Testing to show safe, correct operation and Cybersecurity Susceptibility

To achieve an…

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PIU May Only Get You So Far…

PIU May Only Get You So Far…

exida Failure Rates are Higher Than TÜV Italia. Who Is Right?
  • by Dr. William Goble, CFSE
  • Tuesday, March 05, 2019
  • Certification

exida Failure Rates are Higher Than TÜV Italia. Who Is Right?

An owner-operator engineer compared the failure rates for two similar products from an exida certificate with those from a TÜV Italia certificate.  exida numbers were an order of magnitude higher.  Who is right?  

There are some relevant fundamental facts in the field of Reliability Engineering:

  1. Failure rate prediction methods depend…

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Who gives exida the authority to publish SILSafeData?
  • by Dr. William Goble, CFSE
  • Thursday, January 24, 2019
  • Certification

Who gives exida the authority to publish SILSafeData?

SILSafe Data

SILSafeData contains upper and lower bound ranges of dangerous undetected failure rates for many automation devices. It was created by exida using statistical analysis of FMEDA failure rate predictions. The component database used in the FMEDAx tool is based on…

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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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Functional Safety Certification Started with Logic Solvers
  • by Dr. William Goble, CFSE
  • Tuesday, November 27, 2018
  • Certification

Functional Safety Certification Started with Logic Solvers

IEC 61508 functional safety certification began in the 1990s. As I recall, the only organizations doing this work in those days were TÜV Rheinland and TÜV Product Services (now TÜV Sud). These two companies remain competitors. 

Functional safety certification started with logic solvers. Some engineers and regulators at the…

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Using SILSafeData to Check Your Failure Data Source
  • by Dr. William Goble, CFSE
  • Monday, October 29, 2018
  • Certification

Using SILSafeData to Check Your Failure Data Source

www.SILSafeData.com is a complimentary resource that contains the upper and lower bounds failure rates for many categories of automation equipment, as well as the methodology used by exida to derive the numbers.  

Many of you have asked how to…

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The New Technology in Logic Solvers
  • by Dr. William Goble, CFSE
  • Thursday, September 27, 2018
  • Certification

The New Technology in Logic Solvers

I heard about a “safety certified” PLC in the late 1980s at an ISA SP84 standard committee meeting. The “logic solver” (as they later called it) was the focus of attention in the field of functional safety back then. Many engineers even said, “My system is safe because I…

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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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Functional Safety Assessment of Valve Assemblies  (Part 1)

Functional Safety Assessment of Valve Assemblies (Part 1)

In this blog series, I will cover the emerging trends in the valve assembly market, how these trends relate to the IEC 61511 requirements, and what's in a final element. When you look at the different devices that go into some of these safety systems, the final element becomes…

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Why is Safety Certification So Tough?
  • by John Yozallinas, CFSE
  • Thursday, January 04, 2018
  • Certification

Why is Safety Certification So Tough?

Some organizations complain about the ‘high bar’ to comply with 61508.  They complain that there is too much overhead in documentation and testing, and it all costs too much.  Other organizations actually benefit from this ‘high bar’ as a barrier to entry for competitors.  This is a differentiation factor…

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IEC 61508 Functional Safety Certificates - To Accept or not to Accept?
  • by Dr. William Goble, CFSE
  • Thursday, August 10, 2017
  • Certification

IEC 61508 Functional Safety Certificates - To Accept or not to Accept?

I get an email that includes a “certificate” of some sort most every week.  The sender asks “Can I accept this certificate?”  Or the sender might ask “Are these failure rates valid for the process industries?” 

At exida we have some specific criteria we use when performing third party…

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