This paper explains what a diagnostic test interval (DTI) is, how it is measured, and how it impacts the safety performance of a safety instrumented function (SIF). In applications where a dangerous condition occurs infrequently, the DTI has an insignificant impact on...
According to the basic functional safety standard IEC61508:2010 Part 2, when assessing the safety performance of a safety instrumented function (SIF) operating in high demand mode, full credit can be given for the positive effects of automatic self‐diagnostics (ASD)...
This paper explains how exida applies the requirements of IEC61508:2010 Route 2H to its process of certifying devices for use in safety applications. Rather than having specific designs and a long list of specific rules that become obsolete, the IEC 61508 standard...
An updated version of IEC 61508, Functional Safety of Electrical/Electronic and Programmable Electronic Systems was issued in September 2010. This Second Edition is generally thought to clarify common interpretations of the first edition and add some refinements that...
Electromagnetic Interference (EMI) is just one of the environmental stresses that can stop a system from performing its safety function. It is important for a functional safety system to be immune from the EMI levels that are likely to be present. Unlike other...
