# DefinitionPFD - Probability of failure on demand

#### Marc

##### Hunkered Down for the Duration with a Mask on...
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PFD - Probability of failure on demand

Functional Safety and IEC 61508

Systems comprised of electrical and/or electronic elements have been used for many years to perform safety functions in most application sectors. Computer-based systems (generically referred to as programmable electronic systems) are being used in all application sectors to perform non-safety functions and, increasingly, to perform safety functions.

E.g.: Functional Safety PFH vs PFD

Functional Safety Explained

Corrective Action Column in Control Plan and aligning PFD, PFMEA and Control Plan FMEA and Control Plans 6
H Functional Safety PFH vs PFD according to IEC 61508 Reliability Analysis - Predictions, Testing and Standards 3
PCP, PFMEA and PFD as one document? APQP and PPAP 5
B Submitting a "Preliminary PFD Definition" Process Maps, Process Mapping and Turtle Diagrams 4
R Redundancy in PFD and Control Plans? APQP and PPAP 3
G Process Flow Diagrams - How detailed the PFD has to be QS-9000 - American Automotive Manufacturers Standard 3
Software Risk Management & probability of occurrence as per IEC 62304 IEC 62304 - Medical Device Software Life Cycle Processes 8
Should volume of sales be factored into risk probability assessments? ISO 14971 - Medical Device Risk Management 33
How to qualitatively assess initial probability ISO 14971 - Medical Device Risk Management 4
Probability - Need a help to solve the below question Statistical Analysis Tools, Techniques and SPC 5
Tolerance intervals (?) question - Flow Rate Probability Range Statistical Analysis Tools, Techniques and SPC 6
Small Sample - Lower Limit Probability Statistical Analysis Tools, Techniques and SPC 0
IEC 62304 Section 4.3(a) - 100% probability of failure IEC 62304 - Medical Device Software Life Cycle Processes 3
Balls drawn without replacement probability question Brain Teasers and Puzzles 8
L How to calculate the Probability of Deficiency of the AQL of an Inspection AQL - Acceptable Quality Level 16
Definition PFH - Probability of dangerous failure per hour Definitions, Acronyms, Abbreviations and Interpretations Listed Alphabetically 0
Risk Acceptability Criteria - Probability and Acceptability Level ISO 14971 - Medical Device Risk Management 1
Risk Probability - Is there a Better System? ISO 14971 - Medical Device Risk Management 18
Can Normal Probability Paper and GPC be created with Excel Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 1
Z What is the Probability of Picking Up "Good" alphabets? Six Sigma 6
Hazard Probability of Occurrence Definition ISO 14971 - Medical Device Risk Management 11
E Risk Management selection Probability of Occurrence and Severity ISO 14971 - Medical Device Risk Management 24
C How to calculate P value on Probability Plot Statistical Analysis Tools, Techniques and SPC 1
Probability question - Components of Variation study on a single use diagnostic test Statistical Analysis Tools, Techniques and SPC 1
P One sided confidence interval for probability plot in Minitab Using Minitab Software 1
K Probability of Occurrence Ranking for Low Volume Manufacturing vs High Volume FMEA and Control Plans 11
Repeated Inspection - Probability of Visual Inspection catching Defects Inspection, Prints (Drawings), Testing, Sampling and Related Topics 2
L "Half Normal Plot vs Normal Probability Plot" of Effects Using Minitab Software 1
U PROBLEM: Probability of Resource Access Collision Statistical Analysis Tools, Techniques and SPC 5
S Software Risk Estimation: Probability of Medical Device Software Anomaly Occuring ISO 14971 - Medical Device Risk Management 9
N Bayes Law of Conditional Probability ("The Drunkard's Walk" by Mlodinow) Statistical Analysis Tools, Techniques and SPC 1
S Probability Density Function of a Function of a Random Variable Statistical Analysis Tools, Techniques and SPC 13
V Preparing for SSGB - Six Sigma Probability Question Six Sigma 13
Risk Management - Probability vs. Frequency IEC 60601 - Medical Electrical Equipment Safety Standards Series 3
V ASQ CSSGB - More In Depth Probability and Sampling Methods prep materials Book, Video, Blog and Web Site Reviews and Recommendations 4
A Probability of a good lot given that the sample was good Inspection, Prints (Drawings), Testing, Sampling and Related Topics 8
How Probability of Acceptance of a Part is Calculated Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 4
B Plotting Probability Exceedance using the Probability Plot Graph in Minitab Using Minitab Software 4
I Mathematical Probability Puzzle Brain Teasers and Puzzles 25
1 What are TOP, DPU, DPO, DPMO? Mult-CTQ (discrete) ZST - Is this a probability? Six Sigma 1
Probability of finding a Defective Part - Probability question Statistical Analysis Tools, Techniques and SPC 8
D ISO 2859 - Probability that sample size is sufficient Inspection, Prints (Drawings), Testing, Sampling and Related Topics 2
C Multiple Censored Tests to find out the Survival Probability Reliability Analysis - Predictions, Testing and Standards 3
M Probability Distribution Problem Inspection, Prints (Drawings), Testing, Sampling and Related Topics 5
M Confidence Interval on Normal Probability Plot Using Minitab Software 2
How's this for a probability function? Player Hits Own Mom With Foul Ball Funny Stuff - Jokes and Humour 7
D Probability of Failure - Seven expansion joints Reliability Analysis - Predictions, Testing and Standards 5
Goodness of Fit: Is it normal? Probably...or probably not - it's all probability Imported Legacy Blogs 0
J Xbar - R Control Chart taking into account the Probability Limit Using Minitab Software 8
Calculating axis values of normal probability plot Statistical Analysis Tools, Techniques and SPC 4