Specifications

Publication 1794-RM001F-EN-P - September 2011
Preface 2
MTBF Mean Time
Between Failures
Average time between failure occurrences.
MTTR Mean Time to
Restoration
Average time needed to restore normal operation
after a failure has occurred.
PADT Programming and
Debugging Tool
RSLogix 5000 software used to program and
debug a SIL2-certified FLEX I/O with ControlLogix
application.
PC Personal
Computer
Computer used to interface with, and control, a
ControlLogix system via RSLogix 5000
programming software.
PFD Probability of
Failure on
Demand
The average probability of a system to fail to
perform its design function on demand.
PFH Probability of
Failure per Hour
The probability of a system to have a dangerous
failure occur per hour.
1oo1 One out of one A 1oo1 (one out of one) architecture consists of a
single channel where any dangerous failure leads
to a failure of the safety function.
1oo2 One out of two A 1oo2 (one out of two) architecture consists of
two channels connected in parallel such that
either channel can process the safety function.
Table Preface.2 List of Acronyms Used Throughout the Safety Application Manual
Acronym: Full Term: Definition:
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