EN 954-1 : 1996

Foreword
0 Introduction
1 Scope
2 Normative references
3 Definitions
4 General considerations
5 Characteristics of safety functions
6 Categories
7 Fault consideration
8 Validation
9 Maintenance
10 Information for use
Annexes
Annex A (informative) - Questionnaire for the design
        process
Annex B (informative) - Guidance for the selection of
        categories
Annex C (informative) - List of some significant faults
        and failures for various technologies
Annex D (informative) - Relationship between safety,
        reliability and availability for machinery
Annex E (informative) - Bibliography
Annex ZA (informative) - Clauses of this European Standard
         addressing essential requirements or other provisions
         of EU directives
List of references

Defines safety requirements and guidance on the principles for the design of safety-related parts of control systems.