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Three simplifications in the calculation of safety instrumented system mean time to failure & risk reduction factor clarify the dependence on the various factors involved. These include failure rate, fail safe fraction, diagnostics coverage, etc.
Enterprise-Control System Integration − Part 8: Information Exchange Profilesstandard by The International Society of Automation, 05/08/2020
Enterprise-Control System Integration - Part 5: Business-to-Manufacturing Transactionsstandard by The International Society of Automation, 12/03/2018
Mechanical Integrity of Safety Instrumented Systems (SIS)standard by The International Society of Automation,
Book by The International Society of Automation, 01/01/2006