PREN 50129 : DRAFT 2000

Introduction
1 Scope
2 Normative references
3 Definitions and abbreviations
  3.1 Definitions
  3.2 Abbreviations
4 Overall framework of this standard
5 Conditions for safety acceptance and approval
  5.1 The Safety Case
  5.2 Evidence of quality management
  5.3 Evidence of safety management
  5.3 Evidence of functional and technical safety
  5.4 Safety acceptance and approval
Annex A (normative) Safety Integrity Levels
      A.1 Introduction
      A.2 Safety requirements
      A.3 Safety integrity
      A.4 Allocation of safety integrity requirements
          A.4.1 Risk analysis
      A.5 Safety Integrity Levels
Annex B (normative) Detailed technical requirements
      B.1 Introduction
      B.2 Assurance of correct functional operation
      B.5 Safety-related application conditions
      B.6 Safety Qualification Tests
Annex C (normative) Identification of hardware component failure
        modes
      C.1 Introduction
      C.2 General procedure
      C.3 Procedure for integrated circuits (including
          microprocessors)
      C.4 Procedure for components with inherent physical properties
      C.5 General notes concerning component failure modes
      C.6 Additional general notes, concerning components with
          inherent physical properties
      C.7 Specific notes concerning components with inherent
          physical properties
Annex D (informative) Supplementary technical information
      D.1 introduction
      D.2 Achievement of physical internal independence
      D.3 Achievement of physical external independence
      D.4 Example of a method for single-fault analysis
      D.5 Example of a method for multiple-fault analysis
Annex E (informative) Techniques and measures for safety-related
        electronic systems for signalling for the avoidance of
        systematic faults and the control of random and systematic
        faults
Annex F (informative) Bibliography

Pertains to safety-related electronic systems (including sub-systems and equipment) for railway signalling applications.