exida explains Blog

I Don’t Want No D*** Diagnostics!

After a false trip incident, I heard a control engineer express his displeasure with the automatic diagnostics in a new safety rated transmitter.  The transmitter diagnostics were annunciated by sending the analog current out of range.  In this case, the current went to 3.6 milliamps.  The problem was that…

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The Safety Lifecycle as a Risk Control Loop

I have been doing a number of recent projects introducing the safety lifecycle to companies that are new to the field. As a result I have been playing with various ways to think about the overall safety lifecycle philosophy. As many of the more experienced readers are…

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Too Good to be True

A.K.A You’re About to Severely Under-Design your SIF and Put your People at Risk. Twice this week alone, and much more often than I like to remember, I’ve had safety system designers blindly follow certificates that contain data that simply cannot be true. They get a certificate from…

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To Be an Alarm…Or Not to Be?

  • by John Yozallinas, CFSE
  • Thursday, March 15, 2012
  • Certification

We’re Only Human

We’re only human.  Most of the time, that is a good thing.  But humans seem to accept more risk over time when nothing bad has happened.  We lose our vigilance.  We take more chances.  A close call might only be remembered as an unusually rare anomaly instead of a…

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Do you have class?

  • by John Yozallinas, CFSE
  • Thursday, February 23, 2012
  • Certification

7 Ways to Keep your Auditor Happy

1. Name your files to make auditing easier; a filename with cryptic job numbers and abbreviations that are used within the company may not be easily understood or cataloged by an auditor

2. Give the auditor the ‘secret decoder ring’ for cryptic company acronyms and abbreviations

3. Have clear…

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Babies, Bathwater, and Australian Safety Laws

The old saying goes, “Don’t throw the baby out with the bathwater.” But it looks like a number of people in Australia may be in danger of doing just that with their response to the country’s newly harmonized health and safety laws.

Australia’s new Read More...

Outrage! Panic! Indifference?

How should you react to news of PLC security vulnerabilities? 

Project Basecamp was an exercise conducted at the S4 Security Conference that was held last month in Miami, Florida.  At the event, six security researchers reported their findings on the…

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  • by Iwan van Beurden, CFSE
  • Tuesday, January 17, 2012
  • Certification

Why am I not on “the list?”

  • by Dr. William Goble, CFSE
  • Thursday, January 12, 2012
  • News

2011…A Year in Review

  • by Iwan van Beurden, CFSE
  • Tuesday, December 13, 2011
  • Certification

Make a list…and be sure to check it twice

Let me start by wishing everybody a Happy Holidays and Love, Health, Peace, and Safety for 2012. My 5-year old son is very excited about all the holiday decorations. As we celebrate Christmas in my family, we emphasize the birth of baby Jesus as the reason for Christmas, but,…

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  • by John Yozallinas, CFSE
  • Wednesday, December 07, 2011
  • Certification

It Ought to be a Crime

There is no shortage of drivers who try to “beat the red light,” or roll through a stop sign.  I see it every day (luckily BEFORE they hit my side door).  Even though everyone knows, or should know the “rules of the road,” there are some folks who are…

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NEVER Use B10 Values for PFDavg Calculations

The machine safety community has defined a number called the “B10 number.”  It is a measure of time where 10% of a population of devices should have failed.  Generally it is a measure of expected end of life or “useful life” as defined by the reliability engineering community.

The…

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Field Failure Rate: 10 FITS or 1000 FITS?

After analyzing field failure data from hundreds of data sets from dozens of sources, it is becoming easy to see why results from different studies may vary by an order of magnitude or more. The data collection process itself varies by an order of magnitude or more!  A few…

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