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What Does IEC 61511 Mean by Competency?
Jul 09, 2025When the latest edition of IEC 61511 was published in 2016, one of the key changes was the emphasis on competency and some further guidance on what this means. The relevant clauses in the IEC 61511:2016 are 5.2.2.1 to 5.2.2.3 under Clause 5.2.2: Organization and Resources. I am often asked what is competency? And, in […]
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How can IEC 62443 certification help IACS service providers?
May 28, 2021In the previous blog, it is discussed that how IEC 62443 can help an asset owner. In this blog, let us have a look at how IEC 62443 is useful for IACS service providers. IEC 62443-2-4 and/or IEC 62443-3-3 will apply to you if you are a system service provider who provides system integration service […]
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Functional Safety Assessment of Valve Assemblies (Part 1)
Mar 29, 2018[:en][vc_row][vc_column][vc_column_text]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 quite complex. I will also cover […]
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Fake Fact: Final Elements should not be included in SIF evaluation
Mar 15, 2018[:en][vc_row][vc_column][vc_column_text]Ehh… If your safety action is stopping flow/closing a valve, how are you going to accomplish this if you consider that the remote actuated valve is not part of your SIF ? So, what is this myth based on? The title of IEC 61508 reads “Functional safety of electrical/electronic/programmable electronic safety-related systems”. The argument typically made […]
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You want what?? You want it when??
Mar 09, 2018[:en][vc_row][vc_column][vc_column_text]Estimating time and cost for a project, or even part of a project, can be tricky. Breaking down the tasks into subparts must be done or you don’t stand a chance. Given enough time, you can develop an accurate estimate and put a good plan in place. But sometimes you can’t flush out all the […]
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Software Metrics
Mar 01, 2018[:en][vc_row][vc_column][vc_column_text]Both IEC 61508 and ISO 26262 highly recommend a modular approach to software development. One question that comes up regularly asks if there are quantitative targets for determining whether sufficient progress has been achieved by software engineers. IEC 61508-3 Table B.9 Modular approach ISO 26262-6 Table 1 Topics to be covered by modelling and coding […]