Functional Safety Expert Exam Study Guide: Certified

This is a comprehensive study guide for the TÜV Rheinland Certified Functional Safety Expert (CFSE) exam.

| SIL | Low Demand Mode (PFDavg) | High/Continuous Mode (PFH – failures per hour) | |-----|--------------------------|-------------------------------------------------| | 1 | (10^-2) to (<10^-1) | (10^-6) to (<10^-5) | | 2 | (10^-3) to (<10^-2) | (10^-7) to (<10^-6) | | 3 | (10^-4) to (<10^-3) | (10^-8) to (<10^-7) | | 4 | (10^-5) to (<10^-4) | (10^-9) to (<10^-8) | certified functional safety expert exam study guide

Question 2 (PFDavg & Proof Test)

A 1oo1 SIF has (\lambda_DU = 250) FIT. Proof test interval = 1 year (8760 hr). Proof test coverage = 80%. Effective PFDavg = ? This is a comprehensive study guide for the

10. Verification vs. Validation

Exam Trap: The exam will describe an activity (e.g., "Checking that the SIS logic solver meets the safety requirements specification"). Is this Verification (did we build it right?) or Validation (did we build the right thing?). Answer: That specific example is Verification. Validation is the final check against the SRS at the end. Proof test coverage = 80%