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Similarities
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Defense in Depth
•
Lifecycle approach
•
Stakeholders
•
Requirement for FSM / SM
•
Ongoing monitoring needed
•
Terminology of SIL and SL
Differences
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Focus (internal v. external)
•
Maturity of standards
•
Level of adoption
•
Willingness to share learning
•
Assessment of risk
“Freedom from unacceptable risk of physical injury
or of damage to the health of people, either directly
or indirectly as a result of damage to property or to
the environment.”
IEC 61508-4
“Prevention of illegal or unwanted penetration of or
interference with the proper and intended operation of an
industrial automation and control system”
IEC 62443-1-1
Safety
Security
Comparison of Safety and Security