Failure data collection can seem tedious, time consuming and expensive. Just figuring out what data to collect can be challenging. Failure data analysis can be overwhelming with a sense of “I don’t even know where to begin.” So it is not surprising that these useful, vital activities are often neglected especially when…
If you find yourself faced with this question you might be wondering why it is that having successfully used risk assessments without FMEDA your team are suddenly faced with the complexity of executing FMEDAs.
Maybe us safety people answer with a follow…
A few weeks ago, we were asked to help a fellow colleague who received a message regarding their FS Engineer (TÜV Rheinland) certificate :
We are aware, that the validity of your FS Expert (TÜV Rheinland) certificate is expiring this month. Kindly be informed that we have had a…
IEC 61508 Certification is a Third-Party Validation against the standard’s requirements, comprising of:
To achieve an…
If you’ve got lots of proven field history for a product, you should be able to claim that good work and get your product certified for use in functional safety applications. It is certainly still a challenge, but it is easier than certifying a new product. The…
An owner-operator engineer compared the failure rates for two similar products from an exida certificate with those from a TÜV Italia certificate. exida numbers were an order of magnitude higher. Who is right?
There are some relevant fundamental facts in the field of Reliability Engineering:
SILSafeData contains upper and lower bound ranges of dangerous undetected failure rates for many automation devices. It was created by exida using statistical analysis of FMEDA failure rate predictions. The component database used in the FMEDAx tool is based on…
With the appearance of malware and nation state attacks on Industrial Control Systems (ICS), such as the Stuxnet (2010), Industroyer (2016) and TRITON (2017) attacks, the IEC 62433 standards are gaining wider attention.
While the potential targets to attack in an ICS system are many-fold, one plant asset that…
IEC 61508 functional safety certification began in the 1990s. As I recall, the only organizations doing this work in those days were TÜV Rheinland and TÜV Product Services (now TÜV Sud). These two companies remain competitors.
Functional safety certification started with logic solvers. Some engineers and regulators at the…
www.SILSafeData.com is a complimentary resource that contains the upper and lower bounds failure rates for many categories of automation equipment, as well as the methodology used by exida to derive the numbers.
Many of you have asked how to…
I heard about a “safety certified” PLC in the late 1980s at an ISA SP84 standard committee meeting. The “logic solver” (as they later called it) was the focus of attention in the field of functional safety back then. Many engineers even said, “My system is safe because I…
There’s a lot that exida does behind the scenes to advance the industry and benefit you. We try to make sense of data that we collect and put it to good use. One thing we found is that human activities play a role in functional safety, often causing the intended safety performance…
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…
Some organizations complain about the ‘high bar’ to comply with 61508. They complain that there is too much overhead in documentation and testing, and it all costs too much. Other organizations actually benefit from this ‘high bar’ as a barrier to entry for competitors. This is a differentiation factor…
I get an email that includes a “certificate” of some sort most every week. The sender asks “Can I accept this certificate?” Or the sender might ask “Are these failure rates valid for the process industries?”
At exida we have some specific criteria we use when performing third party…