Rockwell Automation AADvance Controller PFH avg and PFD avg Data - Manual (Page 7)

Document: 553847
(ICSTT-RM449_EN_P) Issue 04:
1-1
The information in this document has been compiled as part of the AADvance IEC
61508 certification, the failure modes and Failure Mode Effect and Diagnostic Analysis
(FMEDA) of each module having been inspected by TUV Rheinland.
The tables below provide PFD
avg
data for AADvance modules used in applications with
an 8 or 24 hour MTTR and with 6 months, 1 year, 5 years or 10 years Manual Test
Interval (MTI). If the AADvance system is to be used in an application with any other
MTTR or MTI, use the data from the next column with a higher MTTR or MTI than
that of the application.
If a de-energize to action system is configured to provide a shutdown on the first fault,
the MTTR has a negligible effect, hence, the tables in the PFD Data can be used for any
MTTR.
In This Chapter In This Chapter In This Chapter In This Chapter
Failure Rates ......................................................................................................... 1-1
PFD Data - 8 Hour MTTR ................................................................................ 1-2
PFD Data - 24 Hour MTTR ............................................................................. 1-4
PFH Data............................................................................................................... 1-6
Safe Failure Fraction (SFF) and Hardware Fault Tolerance (HFT) .......... 1-8
System Configurations ....................................................................................... 1-9
Failure Rates Failure Rates Failure Rates Failure Rates
The following failure rates apply to the AADvance modules:
Table 1: Table 1: Table 1: Table 1: AADvance Module Failure Rates AADvance Module Failure Rates AADvance Module Failure Rates AADvance Module Failure Rates
Module Module Description
MTBF
Years
FPMHλ λ λ λ
T9110 Processor module 95 1.19
T9401 Digital input module, 24Vdc, 8 channel, isolated 93 1.22
T9402 Digital input module, 24Vdc, 16 channel, isolated 50 2.28
T9431 Analogue input module, 8 channel, isolated 93 1.22
T9432 Analogue input module, 16 channel, isolated 50 2.28
T9451 Digital output module, 24Vdc, 8 channel, isolated,
commoned 95 1.19
T9481 Analogue output module, 3 channel, isolated 110 1.04
T9482 Analogue output module, 8 channel, isolated 47 2.39
Chapter Chapter Chapter Chapter 1 1 1 1
Introduction
Introduction Introduction Introduction