What should not be included in the functional requirements of the Safety Requirements Specification (SRS)?

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In the context of a Safety Requirements Specification (SRS), the functional requirements specifically define what a safety system must achieve in terms of performance and behavior under certain conditions. These requirements are grounded in the functionality needed to ensure the safety of the system and mitigate risks.

The Safety Integrity Level (SIL) is a classification used to indicate the required reliability of safety functions, as determined during the safety lifecycle. While SIL is vital for understanding the overall safety target and assessing the necessary reliability of the safety functions, it does not belong in the functional requirements section of the SRS. Instead, SIL is a concept related to the overall safety assessment and verification process, focusing on system design rather than detailing specific functional capabilities.

In contrast, trip values, reset functions, and bypass requirements are indeed functional aspects that express specific behaviors and actions the safety system must perform. These elements provide clear instructions on how the system should react to different scenarios to maintain safety, thereby making them essential for inclusion in the functional requirements of the SRS.