What is a Safety Instrumented Function?

What is a Safety Instrumented Function? One of the most fundamental questions related to Functional Safety and Safety Instrumented Systems is this-what is a safety instrumented function? Once you understand what a Safety Instrumented Function (SIF) means, you will immediately grasp the connection between safety instrumented functions and a Safety Instrumented System (SIS). But more on that later. Any plant or piece of equipment that has the potential to cause harm or damage to itself, the environment or to people needs protective functions. For example your car brake is a protective function. It helps stop the car almost immediately, when for example you spot a pedestrian on the road in front of your car when you are driving it. Ditto with things like pressure cookers or ovens- they all have some protective devices that prevent them from damaging themselves or the surroundings when they malfunction. What is an Instrumented Protective …

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