Safety standards including IEC 61508

2004 ◽  
Author(s):  
R. May
Keyword(s):  
Safety Standards ◽  
Iec 61508

scholarly journals N-version programming approach with implicit safety guarantee for complex dynamic system stabilization applications

2020 ◽  
pp. 002029401988747
Author(s):  
Nadir Subasi ◽  
Ufuk Guner ◽  
Ilker Ustoglu
Keyword(s):  
Essential Element ◽  
Majority Voting ◽  
Programming Approach ◽  
Critical Systems ◽  
Software Safety ◽  
Critical System ◽  
Iso 26262 ◽  
Safety Standards ◽  
Safety Critical ◽  
Iec 61508

Safety-critical systems are widely used in many sectors to prevent fatal accidents and prevent loss of life, damage of property, or deterioration of the environment. Implementation of software safety standards as part of the development of safety-critical software is generally considered an essential element of any safety program. Therefore, it has become more critical to produce highly reliable software to meet the safety requirements established by functional safety standards, such as IEC 61508, ISO 26262, and EN 50128. IEC 61508 supports well-known safety mechanisms such as design diversity like N-version (multi-version) programming. N-version (multi-version) programming is a method where multiple functionally equivalent programs are independently developed from the same software specifications. N-version (multi-version) programming is particularly an effective approach to increase the quality of software in a safety-critical system. In this paper, one of the well-known and widely used algorithms in the field of N-version (multi-version) programming, the majority voting algorithm, has been modified with an online stability checker where the decisions of the voter are judged against the stability of the underlying system. The plant where all the theoretical results are implemented is a tilt-rotor system with the proposed N-version (multi-version) programming–based controller. The experimental results show that the modified majority voter-based N-version (multi-version) programming controller provides more reliable control of the plant.

scholarly journals MODERN SAFETY REQUIREMENTS FOR INDUSTRIAL EQUIPMENT MANAGEMENT SYSTEMS (Part 2. Safety indicators of control systems)

2021 ◽  
Vol 37 (4) ◽  
pp. 8-18
Author(s):  
O. Levchenko ◽  
S. Kashtanov
Keyword(s):  
Control Systems ◽  
National Standards ◽  
Management Systems ◽  
Equipment Management ◽  
Electronic Control ◽  
Industrial Equipment ◽  
Design Development ◽  
Safety Standards ◽  
Safety Requirements ◽  
Iec 61508

Purpose: Analysis and determination of the main modern international safety requirements that must be met in the design, development and operation of industrial equipment management systems, as well as confirmation of the need for further improvement of the domestic regulatory framework in this area. Methodology/approach: Performed analysis of the requirements of modern international standards (IEC 62061 and IEC 61508) on the safety of electrical, electronic and programmable electronic control systems for industrial equipment and the existing sequence of protection against hazards; the algorithm of step-by-step realization of control systems and the basic features of the organization of their structures at the level of functional blocks and subsystems for maintenance of necessary level of completeness of functional safety are defined; the peculiarities of the process of design and development of each of the subsystems and the algorithm of its execution are analyzed; defined algorithms for estimating the probability of dangerous accidental hardware failures for the recommended basic architecture of subsystems (type A, B, C and D) and for the control system itself; provided recommendations on the composition of the specification of safety requirements in the design of control systems; reviewed software requirements. Conclusions: The analysis of the features of functioning and application of modern international safety standards, which must be observed in the design, development and operation of industrial equipment management systems convincingly confirms the relevance and need for further improvement of domestic regulations in this area. Research results:  Modern requirements for the organization of the control system structure at the level of functional units and subsystems to ensure the required level of completeness of functional safety of electrical, electronic and programmable electronic control systems for industrial equipment are determined, as well as features of application the of algorithms for estimating the probability of dangerous accidental failures of control systems and their subsystems. Practical implications: The development and implementation of relevant national standards based on IEC 62061 and IEC 61508 should accelerate the further development of technical progress in Ukraine in the field of industrial safety. Originality/value: Defining the main features of the functioning of modern international safety standards, which must be observed in the design, development and operation of industrial equipment control systems; Appropriate recommendations for their practical application are provided; Substantiated and confirmed the relevance and importance of the development of relevant harmonized national standards based on the standards IEC 62061 and IEC 61508.

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