Siemens SIPART Series User Manual

Abbreviations
SIPART PS2 with and without HART
274 Operating Instructions, 10/2013, A5E00074631-11
Abbreviation
Long form
Meaning
OPOS interface
®
Open Positioner Interface Standard interface for the connection between a positioner
and a pneumatic linear or part-turn actuator
PA
Process Automation
Process automation
PDM
Process Device Manager
Siemens communication software / Engineering tool
PROFIBUS
Process Field Bus
Fieldbus
PTB
Physical Technical Federal Institution
-
SIA
Slit initiator alarm unit
-
SIL
Safety Integrity Level
Safety requirement level as per IEC 61508/IEC 61511
VDE Verband der Elektrotechnik,
Elektronik und Informationstechnik
e. V.
Industrial and professional association
VDI
Verein Deutscher Ingenieure e. V.
Technical/scientific association
Abbreviation
Full term in English
Meaning
FIT Failure in Time Frequency of failure
Number of faults within 10
9
hours
HFT Hardware Fault Tolerance Hardware fault tolerance:
Capability of a function unit to continue executing a required
function in the presence of faults or deviations.
MooN "M out of N" voting Classification and description of the safety-instrumented system
in terms of redundancy and the selection procedures used.
A safety-instrumented system or part that consists of "N"
independent channels. The channels are connected to each
other in such a way that "M" channels are in each case
sufficient for the device to perform the safety instrumented
function.
Example:
Pressure measurement: 1oo2 architecture. A safety-
instrumented system decides that a specified pressure limit has
been exceeded if one out of two pressure sensors reaches this
limit. In a 1oo1 architecture, there is only one pressure sensor.
MTBF
Mean Time Between Failures
Average period between two failures
MTTR Mean Time To Restoration Average period between the occurrence of a fault in a device or
system and restoration of functionality
PFD Probability of Dangerous Failure on
Demand
Probability of dangerous failures of a safety function on demand
PFD
AVG
Average Probability of Dangerous
Failure on Demand
Average probability of dangerous failures of a safety function on
demand
SFF Safe Failure Fraction Proportion of safe failures:
Proportion of failures without the potential to bring the safety-
instrumented system into a dangerous or non-permissible
functional status.

Siemens SIPART Series Specifications

General

Brand	Siemens
Model	SIPART Series
Category	Accessories
Language	English