What should be included in a Safety Requirements Specification (SRS)?

Safety Requirements Specification (SRS) contents: definition of safe state for each SIF, process measurements and setpoints (sensors with ranges and accuracy), logic description (cause and effect, timing requirements), final element actions and response times, manual shutdown requirements, bypass and override requirements, human-machine interface requirements, diagnostic and alarm requirements, proof test requirements and intervals, reliability data assumptions (failure rates, proof test coverage), environmental requirements, and interfaces with other systems. SRS serves as basis for design, verification, and validation. Changes require formal management of change process.