This is a topic which comes up time and again, especially when reviewing legacy systems. Although IEC61511 doesn’t preclude the use of shared devices, it does however provide guidance under Clause 11 of what the constraints are. Even though the Safety Instrumented System (SIS) and Basic Process Control System (BPCS)…
exida explains Blog
- by Steve Gandy, CFSP
- Tuesday, March 30, 2021
- Functional Safety
Why Sharing Components Between SIS & BPCS Is Not A Good Idea
- by Mark Kozub
- Thursday, March 04, 2021
- Functional Safety
Strong Safety Culture Translates to Lower Insurance Premiums
Insurance Companies are hedging their bets through premiums while the Manufacturing Industry is placing their wagers on luck.
The worlds of gambling and insurance are similar in many ways. Both are built upon elements of probability, modeling and quantification of risk. Professional gamblers are well informed on the odds…
- by Patrick O'Brien
- Thursday, February 18, 2021
- Industrial Cybersecurity
Attack on Florida Water System Highlights Weak Security Protections for Critical Infrastructure
The Oldsmar Water Treatment Facility in Pinellas County Florida was compromised by hackers on February 5th. Hackers took advantage of the TeamViewer application that was still installed on the water facilities network to gain remote access1. The TeamViewer was originally installed to allow for status checks and troubleshooting of…
- by Steve Gandy, CFSP
- Monday, February 08, 2021
- Industrial Cybersecurity
IEC 62443 - The Evolution of IACS Cybersecurity
When we were doing safety system designs in the 1980s, there was no Windows, there was no TCP/IP, there was no in Ethernet. We had to write our own protocols to transmit data to our I/O and our controllers.
Fault-finding was always a challenge . What we ended up…
- by Todd Stauffer
- Thursday, February 04, 2021
- Alarm Management
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…
- by Todd Stauffer
- Thursday, January 14, 2021
- Alarm Management
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…
- by Dave Johnson, CFSE
- Thursday, January 07, 2021
- Industrial Cybersecurity
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…
- by Todd Stauffer
- Tuesday, December 08, 2020
- Alarm Management
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:
- What is alarm management?
- Which alarm management standard do…
- by Steve Gandy, CFSP
- Thursday, November 19, 2020
- Functional Safety
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…
- by Casimir-Alvin Musa
- Thursday, November 05, 2020
- Alarm Management
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…
- by Michael Medoff , CFSE, CISA
- Thursday, October 29, 2020
- Industrial Cybersecurity
IEC 62443 Cybersecurity Certification for Medical Devices
exida has traditionally been involved in industries such as oil and gas, chemicals, power generation and automotive. While these are a diverse set of industries, many of the techniques that we use such as FMEDA (Failure Modes Effects and Diagnostic Analysis), Risk Assessment, Threat Modelling, etc.…
- by Dave Johnson, CFSE
- Tuesday, October 20, 2020
- Industrial Cybersecurity
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…
- by Paul Chan, CFSP
- Tuesday, October 13, 2020
- Functional Safety
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…
- by Todd Stauffer
- Tuesday, October 06, 2020
- Alarm Management
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…
- by John Yozallinas, CFSE
- Thursday, September 24, 2020
- Functional Safety
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,…