Honeywell HART STT700 Safety Manual page 5

Terms and Abbreviations
1oo1
Basic Safety
DU
FMEDA
Functional
Safety
GTS
®
HART
HFT
Low demand
mode
PFD
AVG
Safety
Safety
Assessment
SFF
SIF
SIL
SIS
June 2017
One out of one
The equipment must be designed and manufactured such that it protects
against risk of damage to persons by electrical shock and other hazards
and against resulting fire and explosion. The protection must be effective
under all conditions of the nominal operation and under single fault
condition
Dangerous Undetected failures
Failure Modes, Effects and Diagnostic Analysis
The ability of a system to carry out the actions necessary to achieve or
to maintain a defined safe state for the equipment / machinery / plant /
apparatus under control of the system
Global Technical Support Center
Highway Addressable Remote Transducer
Hardware Fault Tolerance
Mode, where the frequency of demands for operation made on a safety-
related system is no greater than one per year and no greater than twice
the proof test frequency.
Average Probability of Failure on Demand
Freedom from unacceptable risk of harm
The investigation to arrive at a judgment - based on evidence - of the
safety achieved by safety-related systems. Further definitions of terms
used for safety techniques and measures and the description of safety
related systems are given in IEC 61508-4.
Safe Failure Fraction, the fraction of the overall failure rate of a device
that results in either a safe fault or a diagnosed unsafe fault.
Safety Instrumented Function, a set of equipment intended to reduce the
risk due to a specific hazard (a safety loop).
Safety Integrity Level, discrete level (one out of a possible four) for
specifying the safety integrity requirements of the safety functions to be
allocated to the E/E/PE safety-related systems where Safety Integrity
Level 4 has the highest level of safety integrity and Safety Integrity Level
1 has the lowest.
Safety Instrumented System – Implementation of one or more Safety
Instrumented Functions. A SIS is composed of any combination of
sensor(s), logic solver(s), and final element(s).
STT700 Safety Manual v