Abstract
We discuss SIL (safety integrity level) assessment for software of E/E/PE (Electrical/Electronic/Programmable Electronic) safety-related systems. The SIL is known as a graded measure representing the safety integrity of E/E/PE safety-related systems, and has been defined in IEC 61508, which is an international standard issued totally in 2000 (the second version has been issued in 2010) for E/E/PE safety-related systems. We try to develop mathematical models for estimating the approximations of the PFD (time-averaged probability of failure on demand) and PFH (time-averaged frequency of dangerous failure per hour), which are the target failure measures of SIL, for the E/E/PE safety-related software by applying the notion of software reliability modeling and assessment methods.
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