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Summary
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Functional Safety standards now explicitly require security to be addressed for Safety
Instrumented Systems.
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As with safety the use of certified products is only part of the answer.
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All system architectures are potentially vulnerable to cyber threats – even Air Gapped.
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SIS specific guidance is out there (e.g. ISA TR84.00.09:2013 and IEC 62443).
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Vendor specific guidance (security concepts) and defence in depth are important
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By following vendor guidance you can address security for Integrated Control & Safety
Systems.
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To meet your safety goals you have to address security.