Functional safety and reliability
properties characterizing the ability of an item to perform a required function under given conditions for a given period of time
Hierarchy#
Ancestors (top) → ABC257 (highlighted) → subclasses and powertype instances. Capped at 12 each; see the full lists in the sections below.
Higher level classes3#
Declared properties20#
device response to a failure in power, hardware or firmware
maximum period of useful life of a device or component as defined by the manufacturer
standard to which a statement on functional safety refers
level of criticality to the plant if a device fails
expectation of the operating time between failures
number of given internal faults that a device can withstand and still perform the required function
number of internal redundancies used in the device
properties characterizing additional information pertinent to assessing the reliability of the device
rate of all the undetected dangerous failures within the channel of the subsystem
rate of all the detected dangerous failures within the channel of the subsystem
rate of all the detected safe failures within the channel of the subsystem
decrease in the probability of dangerous hardware failures resulting from the operation of automatic diagnostic tests
fraction of the overall random hardware failure rate of a device that results in either a safe failure or a detected dangerous failure
rate of all the undetected safe failures within the channel of the subsystem
discrete level (one out of a possible four), corresponding to a range of safety integrity values, where safety integrity level 4 has the highest level of safety integrity and safety integrity level 1 has the lowest
number N where N means that N+1 faults could cause a loss of the safety function
set of elements which interact according to a design, where an element of a system can be another system, called a subsystem, which may be a controlling system or a controlled system and may include hardware, software and human interaction
way in which a safety-related system is intended to be used, with respect to the frequency of demands made upon it, which may be either low demand 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; or high demand or continuous mode, where the frequency of demands for operation made, on a safety-related system is greater than one per year or greater than twice the proof check frequency
interval between tests for failures which are not automatically revealed
maximum altitude at which a device or a device component can operate within its specified limits
Subclasses#
No subclasses
This class is a leaf — no other classes inherit from it.
Metadata#
- Version
- 6
- Revision
- 1
- Status
- Standard
- Publisher
- IEC
- Published in
- IEC 61987
- Responsible committee
- IEC/SC 65E
- Change request
C00128- Dates
- Original: 2017-12-07
- Current version: 2023-01-23
- Current revision: 2023-01-23
Full source data#
Every key from the original .xls export, including multilingual variants, status, publisher, committee, and workbook-specific codes.
Raw properties (28 keys from source .xls) — click to expand
- C002
- C00128
- C011
- IEC
- C012
- IEC 61987
- C016
- Standard
- C017.de
- 0
- C017.fr
- 0
- C018.de
- 2014-12-12
- C018.fr
- 2013-08-27
- C019.de
- Mr. W. Hartmann
- C019.fr
- Mr. W. Hartmann
- MDC_P001_5
- 0112/2///61987#ABC257
- MDC_P002_1
- 6
- MDC_P002_2
- 1
- MDC_P003_0
- 2023-01-23
- MDC_P003_1
- 2017-12-07
- MDC_P003_2
- 2023-01-23
- MDC_P003_3
- 2023-01-23
- MDC_P004.de
- Zuverlässigkeit und funktionale Sicherheit
- MDC_P004.en
- Functional safety and reliability
- MDC_P004.fr
- Sécurité et fiabilité fonctionnelle
- MDC_P006.de
- Merkmale, die die Eigenschaft eines Teils kennzeichnen, eine geforderte Funktion unter gegebenen Bedingungen über einen gegebenen Zeitraum auszuführen
- MDC_P006.en
- properties characterizing the ability of an item to perform a required function under given conditions for a given period of time
- MDC_P006.fr
- propriétés caractérisant la capacité d'un élément à remplir une fonction exigée dans des conditions données pendant une période donnée
- MDC_P010
- 0112/2///61987#ABV501
- MDC_P011
- ITEM_CLASS
- MDC_P012
- IEC/SC 65E
- MDC_P014
- {0112/2///61987#ABA311,0112/2///61987#ABA313,0112/2///61987#ABB016,0112/2///61987#ABB202,0112/2///61987#ABA315,0112/2///61987#ABB167,0112/2///61987#ABB168,0112/2///61987#ABB169,0112/2///61987#ABB193,0112/2///61987#ABB170,0112/2///61987#ABB192,0112/2///61987#ABB908,0112/2///61987#ABB909,0112/2///61987#ABB910,0112/2///61987#ABB911,0112/2///61987#ABB017,0112/2///61987#ABB018,0112/2///61987#ABB019,0112/2///61987#ABP134,0112/2///61987#ABA316}
- MDC_P019
- false
Version history7#
IEC CDD records every published revision of each entity — version number, status, timestamp, and the change request that introduced it. OpenCDD captures the full chain of custody from cdd.iec.ch; the entry marked Current is the one rendered on this page.