Rockwell Automation AADvance Controller PFH avg and PFD avg Data User Manual
Page 5
Document: 553847
(ICSTT-RM449_EN_P) Issue 04:
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This document contains the PFH
avg
and PFD
avg
Data for the AADvance Controller. It
includes examples on how to calculate the final figures for different controller
configurations. The data supports the recommendations in the AADvance Safety
Manual Doc No: 553630.
Abbreviations
Abbreviations
Abbreviations
Abbreviations
Abbreviation Description
FMPH
Failures Per Million Hours
HFT
Hardware Fault Tolerance
MTBF
Mean Time Between Failures
MTTR
Mean time to Repair
MTI
Manual Test Interval
PFDavg
Probability of Failure on Demand - average
PFDe
Probability of Failure on Demand - energized to action
PFDde
Probability of Failure on Demand - de-energized to action
PFHe
Probability of Failure per Hour - energized to action
PFHde
Probability of Failure per Hour - de-energized to action
SFF
Safe Failure Fraction
SIF
Safety Instrumented Function
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