exida explains Blog

Making the Most of Customer Feedback

Making the Most of Customer Feedback

Your organization gets information, feedback, and requests from customers all the time.  It’s up to you to do some preliminary analysis and determine what the customer really wants.  Do they want to buy something?  Do they want to complain about something?  Do they have a need for which no…

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exida Cyber Blog Series 04 - Cybersecurity Metrics, Diagnostics, and Alarms: What’s What?

exida Cyber Blog Series 04 - Cybersecurity Metrics, Diagnostics, and Alarms: What’s What?

Co-written by Todd Stauffer, Director of Alarm Management Services at exida

A wise man once said, “You can’t manage what you don’t measure.” Let's apply this to the world of cybersecurity to discuss the importance of cybersecurity metrics and how they are different from a cyber diagnostic and a…

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IEC 61508 is flexible, but is it Agile?

IEC 61508 is flexible, but is it Agile?

Agile development is a much better fit with IEC 61508 compliant software development than one might think at first blush.

Agile is not a methodology but rather a set of values and principles stated in the Agile manifesto. These principles are designed to force introspection and reflection…

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Why Run-to-Fail Is Not A Good Maintenance Strategy For SIS

Why Run-to-Fail Is Not A Good Maintenance Strategy For SIS

exida Cyber Blog Series 03 - Process Safety and Cybersecurity, Related or Still Distant Cousins?

exida Cyber Blog Series 03 - Process Safety and Cybersecurity, Related or Still Distant Cousins?

To be clear, the above title is meant to capture your attention. We all understand and know that it is unusual for a Process Safety engineer and the IT architect to possess detailed knowledge of both safety and security. In today’s world, the operators, engineers, design and support personnel of…

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Making Use of Leading and Lagging Indicators – Are You Using These for Functional Safety?

Making Use of Leading and Lagging Indicators – Are You Using These for Functional Safety?

Some of you reading this may not be aware or familiar with the terms “leading” and “lagging” indicators, when applied to Functional Safety.  The concept isn’t new but does provide significant benefit when applying this to Functional Safety because, if used correctly, these indicators can help significantly improve performance. …

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exida Cyber Blog Series: 02 - Does your position qualify as a Cyber Sensitive position?

exida Cyber Blog Series: 02 - Does your position qualify as a Cyber Sensitive position?

That’s a great question.

What is a Cyber sensitive position?

A cyber sensitive position is a subset of a job position description that can be graded as Ultra, High, Medium or Low sensitivity with respect to cybersecurity assets and associated potential consequences that may impact an operating company.

What…

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Why Is Functional Safety An Important Piece of Process Safety Management?

Why Is Functional Safety An Important Piece of Process Safety Management?

It’s interesting to note that with the release of the 2016 edition of IEC61511, there’s more emphasis being placed on the need for better functional safety management.  Having taught many courses on Functional Safety over the past few years, I find that most of the…

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exida Cyber Blog Series: 01 - What is Cyber Hygiene?

exida Cyber Blog Series: 01 - What is Cyber Hygiene?

exida would like to welcome our new director of cybersecurity services Dave Gunter.  Dave will be taking us through a multi part blog series based on general cybersecurity evolving into how it pertains to your industrial work environment and what you should do to protect your company…

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Tales from the Certification Wars - Proven In Use versus Certification

Tales from the Certification Wars - Proven In Use versus Certification

Knowing Scope of Work (SOW)

Knowing Scope of Work (SOW)

There was a joke I heard many years ago that went like this…

3 workers were hired to run telephone lines.  The first part of their job was to install the poles on which the wires would run.  Each day, the foreman would ask the workers how many poles…

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What do Nuisance Alarms, the 80-20 Rule, Mental Models, and More Have in Common?

What do Nuisance Alarms, the 80-20 Rule, Mental Models, and More Have in Common?

Most everyone has heard of the “80-20 rule”.  It asserts that for many situations, roughly 80% of the effects (outcomes) come from 20% of the causes (inputs).  This rule was first proposed in the early 1900s by Vilfredo Pareto, who was an Italian engineer, sociologist, economist, political scientist, philosopher,…

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Functional Safety Standards - IEC 61508 vs. IEC 61511

Functional Safety Standards - IEC 61508 vs. IEC 61511

IEC 61508 is considered a basic or “umbrella” standard for functional safety.  It is generic and sometimes even vague.  IEC 61508 was intended that various industry sectors provide their own specific standards and guidelines as needed.  Here we can see the relationship between 61508 and other standards, such as…

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So what does Interference-Free mean?  And why do we care?

So what does Interference-Free mean?  And why do we care?

An Interference-Free component, either as an interface or a defined functional area, is a system component that is neither safety critical (C3) nor safety relevant (C2), but interfaces with such subsystems. 

If a component has been shown to be interference free (C1), then it has been demonstrated that no…

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Getting Good Proof Test Coverage Numbers

Getting Good Proof Test Coverage Numbers

Several years ago we recognized that proof test coverage was an important variable that must be considered when doing PFDavg calculations. We ran some models and discovered that the difference between “perfect” proof test coverage (100%) and a very good 90% could mean a whole SIL

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