Handout 9
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Page 18
InstMC Functional Safety 2016Conference
A more detailed example.
Coded Processing
Time redundancy
Time
Diverse
Operation
Operation
Coding
Comparison
Diverse
Operators
Operators
Diverse
Output
Output
Stop
If D ≠ /C
D = /C
C
A, B
/A, /B
OR
AND
Time diversity and redundancy
Restricted© SiemensAG 2013 All rights reserved.
Page 19
InstMC Functional Safety 2016Conference
Achieving a Specific Systematic Capability for a Safety Product
Summary
• Comply with the general requirements of IEC 61508 for Functional Safety
Management
• Select and implement, with appropriate rigour, the techniques and
measures required to achieve the required Systematic Capability
•
Include any necessary product requirements into the specification
•
Document everything (including rationale for selection, evidence etc)
• Typically a 3
rd
party assessment by independent third party is used to
demonstrate requirements have been met