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ISO 14224 Petroleum, petrochemical and natural gas industries -- Collection and exchange of reliability and maintenance data for equipment is the International Organization for Standardization (ISO) standard relating to the collection of data for the management of the maintenance of equipment, including reliability data.
ISO 15784-2:2015 Part 2: Centre to field device communications using SNMP; ISO 15784-3:2008 Part 3: Application profile-data exchange (AP-DATEX) ISO 15785:2002 Technical drawings – Symbolic presentation and indication of adhesive, fold and pressed joints; ISO 15786:2008 Technical drawings – Simplified representation and dimensioning of holes
The failure mode may then be charted on a criticality matrix using severity code as one axis and probability level code as the other. For quantitative assessment, modal criticality number is calculated for each failure mode of each item, and item criticality number is calculated for each item. The criticality numbers are computed using the ...
ISO 13849 prescribes three methods to determine the MTTF D of a safety channel: use the manufacturer's failure data; use the methods prescribed in Annexes C and D of ISO 13849-1; use 10 years (i.e. assume the channel has low integrity) Mean Time to Failure (MTTF) is assumed constant during the useful life period of a component.
Fault Recovery in FDIR is the action taken after a failure has been detected and isolated to return the system to a stable state. Some examples of fault recoveries are: Switch-off of a faulty equipment; Switch-over from a faulty equipment to a redundant equipment; Change of state of the complete system into a Safe Mode with limited functionalities
An FMEDA can predict failure rates per defined failure modes. For Functional Safety applications the IEC 61508 failure modes (safe, dangerous, annunciation, and no effect) are used. These failure rate numbers can be converted into the alternative failure modes from the automotive functional safety standard, ISO 26262.
The concept of 'dangerous failure' must be rigorously defined for the system in question, normally in the form of requirement constraints whose integrity is verified throughout system development. The actual targets required vary depending on the likelihood of a demand, the complexity of the device(s), and types of redundancy used.
Connection-oriented Presentation protocol – ITU-T Rec. X.226 [ISO/IEC 8823-1] Connectionless Presentation protocol – ITU-T Rec. X.236 [ISO/IEC 9576-1] This layer defines and encrypts/decrypts data types from the application layer. Protocols such as MIDI, MPEG, and GIF are presentation layer formats shared by different applications.