exida explains Blog

Alarm Rationalization: An Art or a Science? – Common Rationalization Mistakes

Alarm Rationalization: An Art or a Science? – Common Rationalization Mistakes

Successful alarm rationalization combines both art and science. From the scientific point of view, rationalization follows a systematic process that applies alarm management principles to determine whether an alarm is justified (needed) and to document its basis (cause, consequence, corrective action, time to respond) and settings (priority, setpoint) in…

Read More...

Rationalize Your Alarm Management Problems Away

Rationalize Your Alarm Management Problems Away

The increasing global adoption of alarm management standards (ISA-18.2 and IEC 62682) is bringing the importance of alarm rationalization to the forefront. Rationalization is defined as the “process to review potential alarms using the principles of the alarm philosophy, to select alarms for design, and to document the rationale…

Read More...

Block that attack!  Getting IEC 62443 Cyber Certified (Part 2)

Block that attack!  Getting IEC 62443 Cyber Certified (Part 2)

This is the next in a series of blogs and papers on the benefits of cyber certification. You can read part 1 here.  Certification provides you with the opportunity to work with an experienced cyber team here at exida, and the vast knowledge of cyber experts worldwide codified in…

Read More...

Alarm Management Frequently Asked Questions (FAQs)

Alarm Management Frequently Asked Questions (FAQs)

The March / April 2020 issue of Intech contains an excellent article by Nick Sands and Donald Dunn, the co-chairs for the ISA-18 committee. 

The article reviews some of the most frequently asked questions on alarm management:

  1. What is alarm management?
  2. Which alarm management standard do…

    Read More...

The Dos and Don’t of SIS Application Programming

The Dos and Don’t of SIS Application Programming

It’s interesting that the majority of the time when people talk about functional safety, they are usually thinking about hardware: what sensors to use, which logic solver, what actuator, solenoid or valve to select; what voting architecture, etc.  What often gets overlooked, initially, is the application program.

Essentially, when…

Read More...

Why should I use an Alarm Deadband?

Why should I use an Alarm Deadband?

As many of you will know, one of the most common form of nuisance to operators working industrial controls are repeating or chattering alarms. On a typical plant, repeating alarms may account for around 50% of the alarm annunciations. They are a problem because the operator will have to…

Read More...

IEC 62443 Cybersecurity Certification for Medical Devices

IEC 62443 Cybersecurity Certification for Medical Devices

Block that attack!  Getting IEC 62443 Cyber Certified (Part 1)

Block that attack!  Getting IEC 62443 Cyber Certified (Part 1)

This is the next in a series of blogs and papers on the benefits of cyber certification.  Certification provides you with the opportunity to work with an experienced cyber team here at exida, and the vast knowledge of cyber experts worldwide codified in the IEC 62443 family of…

Read More...

How the PHA and LOPA are going to affect your SIS

How the PHA and LOPA are going to affect your SIS

Both Process Safety Analysis (PHA) and Layer of Protection Analysis (LOPA) occur in the early stage of the Functional Safety Lifecycle, detailed in both IEC 61511 and IEC 61508. They both serve significant roles in the whole process safety management. Yet, as a facilitator…

Read More...

Alarm System Auditing and Enforcement – The Why and the How

Alarm System Auditing and Enforcement – The Why and the How

One of the more important tasks in the alarm management lifecycle is auditing of the alarm system configuration. Auditing preserves your investment in rationalization, checks for changes that bypassed the MOC process, and helps you to maintain the integrity of the alarm system. Oh, and it also required per…

Read More...

Share the Wealth (of Functional Safety Knowledge)

Share the Wealth (of Functional Safety Knowledge)

Experience is a good teacher.  But how do you get the experience?  

Formal classroom or online training is often available for more general skills, but on-the-job training usually provides a more in-depth path to gain such experience.  After doing a job for a while, working through difficulties with colleagues,…

Read More...

Safety Alarms and Why ISA-84.91.03 is Needed

Safety Alarms and Why ISA-84.91.03 is Needed

On July 27, the US Chemical Safety Board (CSB) issued a Factual Update on their investigation into a release of water containing a toxic gas (hydrogen sulfide) and subsequent fatal injuries sustained at the Aghorn Operating Waterflood Station.  While it is typically not a good idea to comment on investigations…

Read More...

IEC 62061 Machine Safety: “It’s simply the right thing to do”

IEC 62061 Machine Safety: “It’s simply the right thing to do”

I can't begin to tell you how many of our customers share with us how lucky they have been to be incident-free at their plant.

Or, because they have not had an incident in over 10 years, it is hard to justify the cost of a Machine Hazard…

Read More...

Back to Basics: Failure Rates - λS

Back to Basics: Failure Rates - λS

The Greek symbol  λS represents safe or spurious failure rates in functional safety expressed in the unit of measurement of FITs which can be determined through FMEDAs. (FITs (λ) are failures per billion hours, expressed by 10-9 hours).

λS is the number of safe…

Read More...

IEC61511 and Failure Rates

IEC61511 and Failure Rates

Most end users I teach in our FSE100 class are not really aware of or fully, understand when we talk about failure rates.  For example, what’s a FIT mean?  For those end users more versed in this, they understand what is meant by a FIT.  Essentially a device can have…

Read More...