Safety Integrity Level definition

Safety Integrity Level. (SIL) – means a safety integrity level covered in AS 61508: Functional safety of electrical/electronic/programmable electronic safety- related systems and is used where a control circuit employs programmable electronics. For example, a SIL 3 microprocessor-based system will provide an equivalent level of reliability to Category 4 under AS 4024: Safety

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Safety Integrity Level. (SIL) means a safety integrity level covered in AS 61508: Functional safety of electrical/electronic/programmable electronic safety-related systems, and is used where a control circuit employs programmable electronics. For example, a SIL 3 microprocessor-based system will provide an equivalent level of reliability to Category 4 under AS 4024: Safety of machinery, however due to the complexity of the circuits involved in programmable electronics, the SIL is determined based on the probability of component failure, software errors and external influences rather than foreseeable fault conditions.

Examples of Safety Integrity Level in a sentence

• Safety Integrity Level (SIL) review to define safety levels of critical control and safety systems not previously completed.

• If the Product is subject to the application of the ISO 26262, the Supplier, according to the Automotive Safety Integrity Level (ASIL) requirements as specified for the Products’ component(s), must produce all the evidences necessary to demonstrate the compliance with the ISO 26262 prescriptions (including reliability analysis data for all the ASIL level).

• For each identified hazardous event, the severity, controllability and exposure values should be ranked to determine the associated Automotive Safety Integrity Level (ASIL), representing the level of risk.

• The complete development cycle will be covered, with the objective of reaching Safety Integrity Level 3 compliancy.

• This is to be interpreted as the function or system providing an equivalent level of safety as Safety Integrity Level (SIL) 4 as defined within IEC 61508.

• Once the allocation is made, the IEC 61508 defines two modes of operation that will provide a target failure measures located in one of four Safety Integrity Level or SIL.

• The settlement for Modification (384) includes tailored implementation of International Electrotechnical Commission (IEC) standard 61511-1 concurrent with DOE-STD- 1195-2011 as a means of achieving Safety Integrity Level – 2 (SIL-2) for low demand simple Safety Instrumented Functions (SIFs) as described in Section J (DOE order list).

• Related to risk, Safety Integrity Level (SIL) is defined as a relative level of risk-reduction provided by a safety function, or to specify a target level of risk reduction.

• Therefore the embedded controller encompasses mixed criticality ranging from Safety Integrity Level 1 to 3 (SIL1-3).

• IEC 61508 [19, 20, 23] defines the concept of Safety Integrity Level (SIL) as a discrete risk reduction level provided by a safety-related system with values in range between 1 and 4, where 4 is the highest level and 1 the lowest.