exida explains Blog

  • by Dave Butler, CFSE
  • Friday, October 12, 2012
  • Software

IEC 61508 Compliant Module Testing: Part I

3D printers are cool!  I watched a TED talk this past year about them.  I know they have been around for over 30 years, but I still think they’re cool.  As I watched, I thought of the wheel for my dishwasher’s roll-out rack, which had…

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How to Decode an exida IEC 61508 Certificate: Part 2

Click here to read Part 1

Now that you know the step-by-step process of product certification, now let’s take a look at the actual information on the certificate. 

In the left panel (gray background) you will find an exida certification logo. …

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How to Decode an exida IEC 61508 Certificate: Part 1

So you downloaded a product certificate from the exida website and you are trying to understand the information documented in the certificate.  Also, you likely want to know what stands behind the certificate and what was involved in the certification of the product.
 
I’m not…

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  • by Michael Medoff , CFSE, CISA
  • Thursday, September 20, 2012
  • Certification

Component De-rating Without the Overhead

If you were going to build a bridge, you would want to make sure that it did not fall down if there were too many cars on the bridge.  One way that this is accomplished is to overdesign.  If the bridge is expected to hold at most 20,000 pounds,…

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People and Risk: The Common Enemy

In today’s modern society there is an increasing demand for “safer” products/systems, which have to meet increasingly demanding standards.  The management of “risk” is a major factor in ensuring that a product/system can meet its design objectives, as well as satisfying the required standards and, even more importantly, meeting…

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Super-Duper Logic Solver Data; So what?

  • 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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  • by Iwan van Beurden, CFSE
  • Monday, July 23, 2012
  • Software

Analysis and Realization: Done. Let’s Start Operation… What’s Next?

Congratulations! You’ve completed the Analysis and Realization phases of the Safety Lifecycle, and are about to begin the Operation phase, but what’s next? Well obviously you need to do proof testing, but is there anything else? You may be familiar with the figure below:

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Why should I get my mechanical device certified per IEC 61508?

I was recently approached with a question regarding why it would be necessary to certify mechanical devices, such as valves, per IEC 61508 when it is not clearly stated in the standard that the standard is applicable to such devices.  After looking through IEC 61511 and Read More...

Relating Test Data to Operating Modes & “Proven in Use”

Everyone wants data, and generally everyone agrees high quality proven in use data is the best. Properly designed experimental testing is one means to simulate actual operation. That is what we all learned as far back as high school during our chemistry and physics labs. These tests can…

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A False Sense of Security

About 5 years ago I was sitting around a big table in a conference room at a major LNG terminal.  Outside the window I could see a big city harbor filled with boats, bridges, sky scrapers and approximately 5 million people.  I could also see two huge LNG storage…

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(Almost) FREE Security Training

The Department of Homeland Security (DHS) is tasked with many things. One area of focus is Industrial Control Systems (ICS). The Industrial Control Systems Joint Working Group (ICSJWG) was formed to facilitate this focus. This group holds semi-annual conferences (Spring and Fall) in various US cities. These meetings…

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  • by Dr. William Goble, CFSE
  • Thursday, May 31, 2012
  • Certification

DANGER, DANGER, DANGER!

Assumed 10 Demands Per Year

During a SIF verification calculation review this week, the engineer pulled out a safety certificate with very low failure rates for a solenoid valve.  Certificate No. V139 2009 C4-4 [1] states that a solenoid valve has a dangerous failure rate of 4.57…

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“Building Security In”

Cybersecurity continues to be a big problem for the world at large and for control systems specifically.  The amount of time and effort that it can take to simply keep all of the security patches up to date on a large control system can be mind boggling.  No…

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The Battle of the Failure Rates

Site Specific vs. Product Specific

During a field failure analysis study, it was discovered that the calculated failure rate of a specific device varied by more than 4X depending on installation site.  Particularly, it was one specific site with a high failure rate.  While any reliability engineer…

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