Modelling of Hazards Effect on Safety Integrity of Open Transmission Systems

Authors

  • Karol Rástočný University of Žilina
  • Mária Franeková University of Žilina
  • Peter Holečko University of Žilina
  • Iveta Zolotová Technical University of Košice

Keywords:

Safety-related communication system, open transmission system, industrial application, safety integrity level, encryption code, safety code, safety assessment, modelling, Markov model

Abstract

The paper is concerned with safety appraisal of safety-related communication systems (SRComSs) with open transmission system, where except in addition to message transmission integrity also confidentiality is recommended to be provided. The authors focused on safety analysis of safety-related messages transmission secured using cryptographic and safety code mechanisms and on the possibilities of modelling safety-related industrial communication system, where a high safety integrity level SIL3 is required to be guaranteed. The paper features mathematical procedures to calculate the rate of hazardous transmission failure of safety-related messages in the result of electromagnetic interference (EMI) effects in the communication channel and by the presence of random hardware failures of SRComS. The theoretical techniques and safety analyses emerge from risk analysis and are compared with the knowledge gained by the authors during safety verifications of such systems for transportation applications. It is a little explored area, because the standards concerning safety-related control systems (SRCSs) did not support any cryptography-based methods. A quantitative safety integrity analysis of SRComS is based on utilisation of Markov's processes. The proposed Markov's model is applied on an open transmission system built on the IEEE 802.11g standard, which is complemented by cryptographic and safety code. The calculations are performed using Mathematica software tool. The proposed base model is universal and can be modified (simplified) in dependence on the parameters of a specific SRComS.

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Author Biographies

Karol Rástočný, University of Žilina

Department of Control and Information Systems, Faculty of Electrical Engineering

Mária Franeková, University of Žilina

Department of Control and Information Systems

Faculty of electrical Engineering

Peter Holečko, University of Žilina

Department of Control and Information Systems, Faculty of Electrical Engineering

Iveta Zolotová, Technical University of Košice

Department of Cybernetics and Artificial Inteligence, Faculty of Electrical Engineering and Informatics

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Published

2016-07-11

How to Cite

Rástočný, K., Franeková, M., Holečko, P., & Zolotová, I. (2016). Modelling of Hazards Effect on Safety Integrity of Open Transmission Systems. COMPUTING AND INFORMATICS, 35(2), 470–496. Retrieved from http://www.cai.sk/ojs/index.php/cai/article/view/3232