Should Functional Safety impact assessments be undertaken when modifying a SIS?

Typically, many organisations follow a strict regime when it comes to handling operational changes via defined management of change proced...

Do purchasing teams really need to worry about Functional Safety & SIL?

When it comes to complying with the safety standards IEC 61508, IEC 61511 and IEC 62443 for a safety and security project, it is not...

How to remain safe and profitable during Industry 4.0

The arrival of Industry 4.0 is already starting to transform modern industrial operations, paving the way for the smart factories of the fu...

Calculating the proof test effectiveness for a Partial Valve Stroke Test application

The final element of a safety instrumented function is usually the greatest contributing part of the overall SIF PFDavg calculation. Valv...

Do I really need my SIS to be cyber secure?

In the good old days, most Industrial Automation and Control System (IACS) networks were air-gapped from the business network and the Int...

What do I claim is my Proof Test coverage?

Nowadays many devices are designed with efficient internal diagnostic capabilities. For some smart transmitters the automatic diagnostics...

What does the term ‘MTTR’ signify for a SIF?

A Safety Requirements Specification (SRS) will typically specify the values for Mean Time to Restoration for each identified Safety Instru...

I use my process control system for all automation requirements. So what is so special about a SIS?

Many people are unsure of the the difference between a safety instrumented system (SIS) and your process control DCS (BPCS). Both have ...

Do you need to use third party certified software tools when configuring a safety instrumented system (SIS) or SIS devices?

There is always a dilemma for users as to whether it is a mandatory requirement to use a third party certified tool when configuring a saf...

What is the target failure measure for your SIF?

"Which failure measure should I use for my Safety Instrumented Function (SIF)? Is PFDavg or PFH more appropriate?" Unfortunately...