What is BS EN 61078 – Reliability block diagrams about?
BS EN 61078 is an international standard that focuses on reliability block diagrams. BS EN 61078 describes:
- The requirements to apply when reliability block diagrams (RBDs) are used in dependability analysis
- The procedures for modelling the dependability of a system with reliability block diagrams
- How to use RBDs for qualitative and quantitative analysis
- The procedures for using the RBD model to calculate availability, failure frequency and reliability measures for different types of systems with constant (or time-dependent) probabilities of blocks success/failure, and for non-repaired blocks or repaired blocks
Who is BS EN 61078 - Reliability block diagrams for?
BS EN 61078 on reliability block diagrams is useful for:
- The professionals who involved in troubleshooting technical issues
- Systems engineers
- Industries using It systems
Why should you use BS EN 61078 - Reliability block diagrams?
A reliability block diagram (RBD) is a pictorial representation of a system's successful functioning. It shows the logical connection of (functioning) components (represented by blocks) needed for the successful operation of the system (hereafter referred to as “system success”).
BS EN 61078 informs that many different analytical methods of dependability analysis are available, of which the RBD is one. Therefore, the purpose of each method and their individual or combined applicability in evaluating the availability, reliability, failure frequency and other dependability measures as may apply to a given system or component should be examined by the analyst before deciding to use the RBD. BS EN 61078 informs that RBD behaves independently from each other and that the order in which failures occur does not matter then the probabilistic calculations can be extended to time-dependent probabilistic calculations involving non-repaired as well as repaired blocks (e.g. blocks representing non-repaired or repaired components).
What’s changed since the last update?
BS EN 61078:2016 supersedes BS EN 61078:2006. BS EN 61078:2016 includes some technical changes concerning BS EN 61078:2006. These include:
- The structure of the document has been entirely reconsidered, the title modified and the content extended and improved to provide more information about availability, reliability and failure frequency calculations
- Clause 3 has been extended and clauses have been introduced to describe the electrical analogy, the "non-coherent" RBDs and the "dynamic" RBDs
- Annex B about Boolean algebra methods has been extended
- Annex C (Calculations of time-dependent probabilities), Annex D (Importance factors), Annex E (RBD driven Petri net models) and Annex F (Numerical examples and curves) have been introduced
