When building a product such as an anti-lock braking system for an automobile, or a railroad, or process control safety system, making sure that the product works as specified is a big part of functional safety. When it is time for the system to engage to prevent an accident,…
exida explains Blog
- by Michael Medoff , CFSE, CISA
- Thursday, November 29, 2012
- Certification
Tool Qualification and Safety Standards
- by Todd Stauffer
- Monday, November 26, 2012
- Alarm Management
Alarm Rationalization is “Going Green (field)”
- by Dr. William Goble, CFSE
- Thursday, November 15, 2012
- Certification
Certification Accreditation
I am often asked “who says exida can certify a product?” The best answer is of course “the marketplace.” End user owner/operators ask for an exida certificate because they understand why technical competency is so important when evaluating design quality. Then instrumentation manufacturers get an exida certificate because exida…
- by Dave Butler, CFSE
- Tuesday, November 06, 2012
- Software
IEC 61508 Compliant Module Testing: Part 4
Part 3 covered the design of tests, resulting in one or more Module Test Plans. To execute a test plan, one would start with the test plan and a test results template (which could be a copy of the test plan as indicated previously), document the general test information…
- by Michael Medoff , CFSE, CISA
- Tuesday, October 30, 2012
- Industrial Cybersecurity
Industrial Control System Cyber Security – Legislation and Standards
There is a lot of concern around cyber security in Industrial Control Systems. With new threats like Stuxnet and Flame, the perceived risk to critical infrastructure has increased dramatically. There are increased calls for legislation and new methods for dealing with these threats. The history of how we have…
- by Dave Butler, CFSE
- Thursday, October 25, 2012
- Software
IEC 61508 Compliant Module Testing: Part 3
The Test Plan
Assessment requires evidence that module tests are designed properly, run properly, and have been successfully run. Documented test results are also required. In order to meet these requirements it is generally a good idea to document a test plan for each module. Information that applies…
- by Dave Butler, CFSE
- Friday, October 19, 2012
- Software
IEC 61508 Compliant Module Testing: Part 2
Last week you learned about what exactly a module is, and examples of different types of modules. Now we will move on to interfaces, the need for module testing, and code coverage requirements.
An interface, such as the 3D printer’s communication interface, or the format of the 3D data…
- by Michael Medoff , CFSE, CISA
- Tuesday, October 16, 2012
- Industrial Cybersecurity
Pen Testing a Live Control System – Are You Mad?
A recent, disturbing trend I’ve seen in industrial control system (ICS) security is that, in response to concerns about the security of their ICS & SCADA systems, companies are performing penetration (pen) testing on operational systems. Often times they request these services as one of the first steps in…
- by Dave Butler, CFSE
- Friday, October 12, 2012
- Software
IEC 61508 Compliant Module Testing: Part I
3D printers are cool! I watched a TED talk this past year about them. I know they have been around for over 30 years, but I still think they’re cool. As I watched, I thought of the wheel for my dishwasher’s roll-out rack, which had…
- by Steve Close
- Thursday, October 04, 2012
- Certification
How to Decode an exida IEC 61508 Certificate: Part 2
Now that you know the step-by-step process of product certification, now let’s take a look at the actual information on the certificate.
In the left panel (gray background) you will find an exida certification logo. …
- by Steve Close
- Thursday, September 27, 2012
- Certification
How to Decode an exida IEC 61508 Certificate: Part 1
So you downloaded a product certificate from the exida website and you are trying to understand the information documented in the certificate. Also, you likely want to know what stands behind the certificate and what was involved in the certification of the product.
I’m not…
- by Michael Medoff , CFSE, CISA
- Thursday, September 20, 2012
- Certification
Component De-rating Without the Overhead
If you were going to build a bridge, you would want to make sure that it did not fall down if there were too many cars on the bridge. One way that this is accomplished is to overdesign. If the bridge is expected to hold at most 20,000 pounds,…
- by Steve Gandy, CFSP
- Thursday, August 30, 2012
- Certification
People and Risk: The Common Enemy
In today’s modern society there is an increasing demand for “safer” products/systems, which have to meet increasingly demanding standards. The management of “risk” is a major factor in ensuring that a product/system can meet its design objectives, as well as satisfying the required standards and, even more importantly, meeting…
- by Iwan van Beurden, CFSE
- Thursday, August 23, 2012
- Functional Safety
Super-Duper Logic Solver Data; So what?
I am working on a SIL verification project and just had to share some observations.
For this project, the customer decided to choose a logic solver for which no data is listed in the exida Safety Equipment Reliability Handbook (SERH). One could…
- by John Yozallinas, CFSE
- Thursday, August 16, 2012
- Certification
Are You Going for Gold in Safety?
Olympic athletes don’t wake up one day and decide to compete in the Olympics. They don’t arrive at the games by chance or coincidence. Their journey starts long before the games begin. They are often influenced and inspired by watching others or by their own interests. They may begin…