Siemens SIPART Series Operating Instructions Manual page 276
Electropneumatic positioners with and without hart
Hide thumbs
Also See for SIPART Series:
- Compact operating instructions (35 pages) ,
- Operating instructions manual (44 pages)
Table of Contents
Abbreviations
Abbreviation
Long form
OPOS interface
Open Positioner Interface
®
PA
Process Automation
PDM
Process Device Manager
PROFIBUS
Process Field Bus
PTB
Physical Technical Federal Institution -
SIA
Slit initiator alarm unit
SIL
Safety Integrity Level
VDE
Verband der Elektrotechnik,
Elektronik und Informationstechnik
e. V.
VDI
Verein Deutscher Ingenieure e. V.
Abbreviation
Full term in English
FIT
Failure in Time
HFT
Hardware Fault Tolerance
MooN
"M out of N" voting
MTBF
Mean Time Between Failures
MTTR
Mean Time To Restoration
PFD
Probability of Dangerous Failure on
Demand
PFD
Average Probability of Dangerous
AVG
Failure on Demand
SFF
Safe Failure Fraction
274
Meaning
Standard interface for the connection between a positioner
and a pneumatic linear or part-turn actuator
Process automation
Siemens communication software / Engineering tool
Fieldbus
-
Safety requirement level as per IEC 61508/IEC 61511
Industrial and professional association
Technical/scientific association
Meaning
Frequency of failure
Number of faults within 10
Hardware fault tolerance:
Capability of a function unit to continue executing a required
function in the presence of faults or deviations.
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.
Average period between two failures
Average period between the occurrence of a fault in a device or
system and restoration of functionality
Probability of dangerous failures of a safety function on demand
Average probability of dangerous failures of a safety function on
demand
Proportion of safe failures:
Proportion of failures without the potential to bring the safety-
instrumented system into a dangerous or non-permissible
functional status.
Operating Instructions, 10/2013, A5E00074631-11
hours
9
SIPART PS2 with and without HART
Table of Contents
