February 2001

Columns

HP Automation Safety: Comparing failure rates

Safety integrity level (SIL) verification per ISA84.01 and IEC61508 requires that a probabilistic evaluation be done on the hardware used in a safety instrumented function (SIF). Data n..

Goble, W., exida LLC

Safety integrity level (SIL) verification per ISA84.01 and IEC61508 requires that a probabilistic evaluation be done on the hardware used in a safety instrumented function (SIF). Data necessary for that evaluation included failure rates, failure mode percentages and diagnostic coverage factors (if any). These data are needed for each component in the SIF. Those manufacturers who get products third-party certified per IEC61508 are required to publish the data or provide some other means to allow a potential user of the product to do the probabilistic evaluations. One of the first manufacturers to get a safety PLC approved

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