exida explains Blog

Psychometrics – Another reason CFSE remains the Gold Standard

Psychometrics – Another reason CFSE remains the Gold Standard

In today’s day and age, functional safety certificate and certification programs are becoming common. There are many to choose from with their own set of requirements and expectations.  

So how do we know which one…

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Back to Basics 23 – Stiction

Back to Basics 23 – Stiction

What is Stiction? 

stiction

Stiction is the resistance to the start of motion usually measured as the difference between the external force being applied in order to overcome the static friction…

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Why Bother With Systematic Issues?

Why Bother With Systematic Issues?

You may be wondering why this question is being asked?  Isn’t it obvious that systematic issues are important and need to be considered?  It may be that some of you reading this blog may not even…

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Back to Basics 22 – Cycle Testing

Back to Basics 22 – Cycle Testing

A cycle test is done on a set of products (>20) until 10% of the units under test fail. 

The number of cycles is converted to a time period by knowing the cycles per…

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ISO 26262 Independence and Related Terms

ISO 26262 Independence and Related Terms

Back to Basics 21 – The B10 Method

Back to Basics 21 – The B10 Method

The B10 method uses cycle test data to predict failure rates. 

A cycle test is done on a set of products (>20) until 10% of the units under test fail. The number of cycles until…

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Alarm Response Procedures: More than Just a Good Idea

Alarm Response Procedures: More than Just a Good Idea

From an operations point of view, one of the significant parts of the ISA-18.2 and IEC 62682 alarm management standards is the endorsement of alarm response procedures. An alarm response procedure, otherwise known as “Alarm…

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Back to Basics 20 – Safe Failure Fraction, SFF

Back to Basics 20 – Safe Failure Fraction, SFF

Safe Failure Fraction (SFF) is defined as the ratio of the average rate of safe failures plus dangerous detected failures of the subsystem to the total average failure rate of the subsystem. It is…

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Getting the Best IEC 62443 Cybersecurity Certification?

Getting the Best IEC 62443 Cybersecurity Certification?

After careful planning and development of your system, the last thing you want to worry about is the credibility of your certification. Although it may seem like a given for your certification to be…

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Back to Basics 19 – Route 2H

Back to Basics 19 – Route 2H

Route 2H is one of two Architectural constraints options made available in the standards IEC 61508-2 and IEC 61511. Route 1H . Both Route 1H and Route 2H are limitations that impose the hardware selected to implement…

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CSB Cites Lack of Alarm Management as Contributing Factors to Blowout in Oklahoma

CSB Cites Lack of Alarm Management as Contributing Factors to Blowout in Oklahoma

Back to Basics 18 – Route 1H

Back to Basics 18 – Route 1H

Route 1H is one of two Architectural constraints options made available in the standards IEC 61508-2 and IEC 61511. Route 1H . Both Route 1H and Route 2H are limitations that impose the hardware selected to…

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exida’s Safety Reliability Analysis (SRA) and How It May Help You

exida’s Safety Reliability Analysis (SRA) and How It May Help You

We all know that an FMEDA is only as good as the assumptions made regarding typical design engineering practices and the database used for the failure rates.  Here is the catch, not…

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Delivering Situation Awareness During an Alarm Flood: Throw Your Operators a Lifeline

Delivering Situation Awareness During an Alarm Flood: Throw Your Operators a Lifeline

Alarm floods are periods of alarm activity during which the alarm rate is greater than the operator can effectively manage (e.g., when the operator receives ≥10 alarms in 10 minutes). During a flood situation awareness is compromised…

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The Site Safety Challenge – Do You Follow Good Site Practices?

The Site Safety Challenge – Do You Follow Good Site Practices?

The question of whether companies follow good site safety practices is an interesting one. Firstly, what do we mean by good site safety practices?  I think most companies believe they follow good site safety practices but…

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