3. New calculation requirements
3.1 SIL reminder
The SIL (safety integrity level) specifies the integrity requirements for each safety function performed by E/E/EP systems. Four SIL levels ranging from 1 to 4 characterize these systems:
SIL 4 refers to the "highest" safety level;
SIL 1 refers to the "lowest" security level.
The concept of SIL applies to a RIS as a whole, and not to any individual component or sub-assembly. Nonetheless, some equipment suppliers are now using it as a selling point.
Standards IEC 61508 and 61511 define different...
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New calculation requirements
Conclusion
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