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Comparing performance level estimation of safety functions in three distributed structures

Author

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  • Hietikko, Marita
  • Malm, Timo
  • Saha, Heikki

Abstract

The capability of a machine control system to perform a safety function is expressed using performance levels (PL). This paper presents the results of a study where PL estimation was carried out for a safety function implemented using three different distributed control system structures. Challenges relating to the process of estimating PLs for safety related distributed machine control functions are highlighted. One of these examines the use of different cabling schemes in the implementation of a safety function and its effect on the PL evaluation. The safety function used as a generic example in PL calculations relates to a mobile work machine. It is a safety stop function where different technologies (electrical, hydraulic and pneumatic) can be utilized. It was detected that by replacing analogue cables with digital communication the system structure becomes simpler with less number of failing components, which can better the PL of the safety function.

Suggested Citation

  • Hietikko, Marita & Malm, Timo & Saha, Heikki, 2015. "Comparing performance level estimation of safety functions in three distributed structures," Reliability Engineering and System Safety, Elsevier, vol. 134(C), pages 218-229.
    • Handle: RePEc:eee:reensy:v:134:y:2015:i:c:p:218-229
    DOI: 10.1016/j.ress.2014.10.024
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    References listed on IDEAS

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    1. Jocelyn, Sabrina & Baudoin, James & Chinniah, Yuvin & Charpentier, Philippe, 2014. "Feasibility study and uncertainties in the validation of an existing safety-related control circuit with the ISO 13849-1:2006 design standard," Reliability Engineering and System Safety, Elsevier, vol. 121(C), pages 104-112.
    2. Hietikko, Marita & Malm, Timo & Alanen, Jarmo, 2011. "Risk estimation studies in the context of a machine control function," Reliability Engineering and System Safety, Elsevier, vol. 96(7), pages 767-774.
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    Cited by:

    1. Poisson, Pascal & Chinniah, Yuvin & Jocelyn, Sabrina, 2016. "Design of a safety control system to improve the verification step in machinery lockout procedures: A case study," Reliability Engineering and System Safety, Elsevier, vol. 156(C), pages 266-276.
    2. Porras-Vázquez, Alberto & Romero-Pérez, Julio-Ariel, 2018. "A new methodology for facilitating the design of safety-related parts of control systems in machines according to ISO 13849:2006 standard," Reliability Engineering and System Safety, Elsevier, vol. 174(C), pages 60-70.

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    1. Porras-Vázquez, Alberto & Romero-Pérez, Julio-Ariel, 2018. "A new methodology for facilitating the design of safety-related parts of control systems in machines according to ISO 13849:2006 standard," Reliability Engineering and System Safety, Elsevier, vol. 174(C), pages 60-70.
    2. Jocelyn, Sabrina & Baudoin, James & Chinniah, Yuvin & Charpentier, Philippe, 2014. "Feasibility study and uncertainties in the validation of an existing safety-related control circuit with the ISO 13849-1:2006 design standard," Reliability Engineering and System Safety, Elsevier, vol. 121(C), pages 104-112.

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