I got an email saying that the exida's www.SILSafeData.com minimum failure rates were way too high. The email went on to say that his REAL field failure data showed a result of 150 FITS for a remote actuated valve assembly. The lowest SILSafeData limits for clean service, Class IV leakage,…
exida explains Blog
- by Dr. William Goble, CFSE
- Thursday, September 19, 2019
- Functional Safety
My Final Element Field Failure Data says 150 FITS and OREDA is 2000 FITS
- by Ted Stewart, CFSP, exidaCSP
- Tuesday, September 17, 2019
- Certification
Personnel Certification Concerns? We are Here to Help.
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…
- by Dr. Steve Gandy, CFSP
- Thursday, September 12, 2019
- Industrial Cybersecurity
Are Your Control Systems Really Protected?
I don’t know whether you’ve noticed recently, but the number of cybersecurity alerts issued by CISA (Cybersecurity and Infrastructure Security Agency) seems to be increasing at an alarming rate. The latest alert I’ve seen now relates to GPS tracking systems for children. A device which is supposed to keep…
- by Loren Stewart, CFSE
- Thursday, September 05, 2019
- Functional Safety
Back to Basics 14 - Systematic Capability
Systematic Capability is achieved when the equipment used to implement any safety function achieves two goals: the design process has used procedures intended to prevent systematic design errors (fault avoidance) and the design has systematic design control mechanisms such as a diagnostic for incorrect software execution (fault control). The rigor…
- by Jonathan Moore
- Thursday, August 29, 2019
- Functional Safety
Let’s Talk About Configuration Management and ISO 26262
Most software developers are familiar with the need for and benefits of change control. Usually change control means one thing to a software developer and that is 'commits' to a source code revision control system. Not only do small and regular commits provide significant advantages to large teams of…
- by John Yozallinas, CFSE
- Thursday, August 22, 2019
- Functional Safety
Do You Really Know What You Know (When it Comes to Functional Safety)?
You don’t’ really know what you know until you have to explain it (or teach it) to someone else.
When I’m asked about some of the technical aspects of functional safety, I have to stop and ask myself “What Do I Know About This?” I’m not the kind…
- by Loren Stewart, CFSE
- Tuesday, August 13, 2019
- Functional Safety
Back to Basics 13 - How Do I Start IEC 61508 Certification?
Do you want to know more about IEC 61508 certification, but you’re not sure if you are ready to jump in? Don’t worry, we will make this process as painless as possible.
Here is what to expect:
- Introduce Scope
- Kickoff Meeting
- Perform FMEDA on Product
- Creation of…
- by Robert J. Michalsky
- Thursday, August 08, 2019
- Industrial Cybersecurity
Building Cybersecurity into Software Applications
An April 2019 report from the Institute of Critical Infrastructure Technology (ICIT) makes the point that even though software ‘runs the world’, software security is an afterthought across virtually all industries.
The report states that this lack of software security is actually a National Threat given that this…
- by Loren Stewart, CFSE
- Tuesday, July 30, 2019
- Certification
Back to Basics 12 – What is IEC 61508 Certification?
IEC 61508 Certification is a Third-Party Validation against the standard’s requirements, comprising of:
- Detailed Analysis of engineering processes to determine Systematic Capability and Cybersecurity Strength
- Detailed Analysis of hardware design / design margins resulting in Random Failure Rate in all failure modes
- Analysis/Testing to show safe, correct operation and Cybersecurity Susceptibility
To achieve an…
- by Todd Stauffer
- Thursday, July 18, 2019
- Alarm Management
When is an Alarm not an Alarm?
The ISA-18.2 and IEC 62682 standards define an alarm as an “audible and/or visible means of indicating to the operator an equipment malfunction, process deviation, or abnormal condition requiring a timely response”. One of the reasons why alarm systems are out of control (alarm overload, nuisance alarms)…
- by Loren Stewart, CFSE
- Wednesday, June 26, 2019
- Functional Safety
Back to Basics 11 – How is SIL Used by an End User?
IEC 61508 and IEC 61511 functional safety standards allow Safety Integrity Levels (SIL) to be used four ways by end users:
- To establish risk reduction requirements - How much risk needs/can be removed from the process to achieve a tolerable risk level? (For more…
- by Ted Stewart, CFSP, exidaCSP
- Wednesday, June 19, 2019
- Industrial Cybersecurity
IEC62443 - Learning Cybersecurity (Prevention Techniques)
Last Saturday, I read an article about hackers who were behind at least two potentially fatal intrusions on oil and gas industrial facilities (Yes I read cyber articles on the weekend 😉). Besides the fact that I enjoy learning about cybersecurity on my days off, what I noticed is…
- by Loren Stewart, CFSE
- Tuesday, June 11, 2019
- Functional Safety
Back to Basics 10 – How Does a Product Get a SIL?
IEC 61508 functional safety standard indicates Safety Integrity Levels (SIL) needs to be evaluated by three design barriers:
- The Systematic Capability Rating
- The Architectural Constraints for the Element
- The Probability of Failure for the Product
Systematic Capability is achieved when the equipment…
- by Jeff Davis
- Thursday, June 06, 2019
- Industrial Cybersecurity
SCRUM and IEC 62443
Information Technology (IT) is the personnel, hardware, and software that controls non-physical devices and/or processes such as websites, financial data, personal information, etc.
Operation Technology (OT) is the personnel, hardware, and software that controls physical devices and/or processes such as manufacturing, oil & gas, power, etc. Today, OT has many…
- by Loren Stewart, CFSE
- Thursday, May 30, 2019
- Functional Safety
Back to Basics 09 – Safety Lifecycle – IEC 61511
The IEC 61511 standard recommends the use of a functional safety lifecycle. Any safety lifecycle can be used, but the standard lays out a process which can be divided into three main classifications as an example.
The lifecycle is set up like this:
- Analyze the situation and document…