Specific IEC 61508 SIL Support
Safety Integrity Level (SIL)-as defined by the IEC 61508 standard-is one of the four levels (SIL1-SIL4) corresponding to the range of a
given safety function's target likelihood of dangerous failures. Each safety function in a safety-related system needs to have
appropriate safety integrity level assigned. According to IEC 61508, the safety integrity level for a given function is evaluated
based on either the average probability of failure to perform its design function on demand (for a low demand mode of operation)
or on the probability of a dangerous failure per hour (for a high demand or continuous mode of operation). The IEC 61508 standard
specifies the requirements for achieving each safety integrity level. These requirements are more rigorous at higher levels of
safety integrity in order to achieve the required lower likelihood of dangerous failures.
For a detailed look at how Parasoft addresses the requirements for achieving each SIL safety integrity level as defined by the
IEC 61508 standard, see our white paper Satisfying SIL Requirements:
Ensure Functional Safety of E/E/PE Safety-Related Systems.