Principles, Standards and Implementation

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System Design According to IEC/EN 62061

Introduction Subsystem Design: IEC/EN 62061 Affect of the Proof Test Interval Affect of Common Cause Failure Analysis Common Cause Failure (CCF) Diagnostic Coverage (DC)
Hardware Fault Tolerance Management of Functional Safety Proof Test Interval Safe Failure Fraction (SFF) Systematic Failure
Hardware Fault Tolerance

Hardware fault tolerance represents the number of faults that can be sustained by a subsystem before it causes a dangerous failure. For example, a hardware fault tolerance of one means that two faults could cause a loss of the safety-related control function but one fault would not.