Inherently safe subsystem
subsystem without dangerous failure mode
- Inherited
- 7
Hierarchy#
Ancestors (top) → ACG069 (highlighted) → subclasses and powertype instances. Capped at 12 each; see the full lists in the sections below.
Higher level classes3#
Declared properties#
No declared properties
This class does not declare any properties of its own.
Inherited properties (7) — click to expand
discrete level (one out of a possible three) for describing the capability to perform a safety function where safety integrity level three has the highest level of safety integrity and safety integrity level one has the lowest
time interval between tests performed to detect dangerous hidden failures in a safety-related system
discrete level used to specify the ability of safety-related parts of control systems to perform a safety function under foreseeable conditions
classification of the subsystem in respect to its resistance to faults and its subsequent behaviour in the fault condition, and which is achieved by the structural arrangement of the parts, fault detection and/or by their reliability
average frequency of dangerous failure of a safety-related control system to perform a specified safety function over a given period of time
mean number of operating cycles at which ten percent of the components fail dangerously
expectation of the mean time to dangerous failure
Imported properties4#
Subclasses#
No subclasses
This class is a leaf — no other classes inherit from it.
Is case of (powertype parents)2#
Metadata#
- Synonyms
- device type 4
- Note
- The absence of dangerous failure mode is called also fault exclusion.
- Source document
- Derived from ISO 13849:2022, O.1.5
- Version
- 1
- Revision
- 1
- Status
- Standard
- Publisher
- IEC
- Responsible committee
- IEC/TC 121
- Change request
C00094- Dates
- Original: 2025-09-26
- Current version: 2025-09-26
- Current revision: 2025-09-26
Full source data#
Every key from the original .xls export, including multilingual variants, status, publisher, committee, and workbook-specific codes.
Raw properties (40 keys from source .xls) — click to expand
- C002
- C00094
- C011
- IEC
- C016
- Standard
- C017.de
- 1
- C017.fr
- 1
- C017.zh
- 1
- C018.de
- 2025-09-01
- C018.fr
- 2021-01-14
- C018.zh
- 2025-08-05
- C019.de
- DKE, Silvio Foertsch
- C019.fr
- IEC TC 121/WG 3
- C019.zh
- SAC,Jia Feng
- MDC_P001_5
- 0112/2///62683#ACG069
- MDC_P002_1
- 1
- MDC_P002_2
- 1
- MDC_P003_0
- 2025-09-25
- MDC_P003_1
- 2025-09-26
- MDC_P003_2
- 2025-09-26
- MDC_P003_3
- 2025-09-26
- MDC_P004.de
- Inhärent sicheres Teilsystem
- MDC_P004.en
- Inherently safe subsystem
- MDC_P004.fr
- Sous-système intrinsèquement sûr
- MDC_P004.zh
- 固有安全子系统
- MDC_P006_1
- Derived from ISO 13849:2022, O.1.5
- MDC_P006.de
- Teilsystem ohne gefährlichen Ausfallmodus
- MDC_P006.en
- subsystem without dangerous failure mode
- MDC_P006.fr
- sous-système sans mode de défaillance dangereux
- MDC_P006.zh
- 无危险失效模式的子系统
- MDC_P007.en
- device type 4
- MDC_P007.fr
- dispositif de type 4
- MDC_P008.de
- Das Fehlen gefährlicher Ausfallarten wird auch als Fehlerausschluss bezeichnet.
- MDC_P008.en
- The absence of dangerous failure mode is called also fault exclusion.
- MDC_P008.fr
- L'absence de mode de défaillance dangereux est également appelée exclusion de défaut.
- MDC_P008.zh
- 危险失效模式的缺失也称为故障排除。
- MDC_P010
- 0112/2///62683#ACG000
- MDC_P011
- ITEM_CLASS
- MDC_P012
- IEC/TC 121
- MDC_P013
- {0112/2///62683#ACC077,0112/2///62683#ACC078}
- MDC_P019
- false
- MDC_P090
- {0112/2///62683#ACE051,0112/2///62683#ACE058,0112/2///62683#ACE060,0112/2///62683#ACE063}
Version history1#
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.