List Of Abbreviations - Siemens SITRANS SL Safety Manual

List of abbreviations

Abbreviations
Abbreviation Full term
> Greater than
< Less than
% Percent
CO Carbon monixide or
carbonous oxide
(molecular formula)
DC Diagnostic Coverage
FIT Failure In Time
FMEDA Failure Modes, Effects and
Diagnostic Coverage Analysis
HFT Hardware Fault Tolerance
IEC International Electrotechnical
Commission
I/O Input/Output
LUI Local User Interface
mA Milliampere
MLFB Maschinenlesbare
Fabrikatebezeichnung
MTBF Mean Time Between Failures
MTTR Mean Time To Repair
NAMUR Normenarbeitsgemeinschaft für
Mess- und Regeltechnik
Safety Manual
Operating Instructions, 06/2012, A5E03433511-05
Meaning
Mathematical sign for inequality
Mathematical sign for inequality
Mathematical sign for the hundredth part of a whole
A colorless, odorless, and tasteless gas, which is highly toxic to
humans and animals in higher quantities. It consists of one carbon
atom and one oxygen atom, connected by a triple bond that consists
of two covalent bonds as well as one dative covalent bond.
In case of SITRANS SL: A measuring component
Parameter which describes the ratio of the failure rate of detected
dangerous failures to the failure rate of all dangerous failures.
Frequency of failures of the protective function.
Method to determine out of an overall failure rate of a system the
proportion of failures without the potential to bring the safety-
instrumented system into a dangerous or impermissible functional
status (SFF) and the diagnostic coverage (DC) according to the
requirements to IEC 61508.
Capability of a function unit to continue execution of a required
function in the presence of faults or deviations.
An international standards organization dealing with electrical,
electronic and related technologies
I/O refers to the communication between an information processing
system (such as a computer), and the outside world, such as a
human, or another information processing system. Inputs are the
signals or data received by the system, and outputs are the signals
or data sent from it.
User interface for access to Siemens Process analyzers and
instruments
A unit of electrical current
German for
Machine-readable product identification, a product code
Average period between two failures
Average period between the occurrence of a fault on a device or
system and its repair
NAMUR is an international user association of automation
technology in process industries
List of abbreviations
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