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Diagnostics of an output interface of a safety-related system with safety PLC

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Abstract

Safety programmable logic controllers (S-PLCs) provide broad application options and are being used to perform control but primarily safety functions (SFs) on the process control level. An essential part of control systems based on S-PLC is the sensors and actuators. In order to ensure the SF with high safety integrity level (SIL), the control system performing this SF has to dispose of a suitable failure detection mechanism and a mechanism providing its safe reaction in case of a failure detection. The diagnostics provided by S-PLC is mainly focused on its own components, and the diagnostics of sensors and actuators has to be resolved on the application program level while respecting some specific properties of S-PLC. This paper addresses the analysis of the influence of S-PLC parameters and diagnostic parameters on the safety function SIL, which is performed by a safety relevant electronic system. In the practical part is described the implementation of application diagnostics in S-PLC and the results of diagnostic parameters influence on safety integrity of SF for a selected example connected to a practical application.

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Acknowledgements

This paper has been supported by the Educational Grant Agency of the Slovak Republic (KEGA) Number: 034ŽU-4/2016: implementation of modern technologies focusing on control using the safety PLC into education.

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Authors and Affiliations

  1. Faculty of Electrical Engineering, Department of Control and Information Systems, University of Žilina, Univerzitná 8215/1, 010 26, Zilina, Slovak Republic

    Karol Rástočný, Juraj Ždánsky, Jozef Balák & Peter Holečko

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  1. Karol Rástočný
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  2. Juraj Ždánsky
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  3. Jozef Balák
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  4. Peter Holečko
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Correspondence to Peter Holečko.

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Rástočný, K., Ždánsky, J., Balák, J. et al. Diagnostics of an output interface of a safety-related system with safety PLC. Electr Eng 99, 1169–1178 (2017). https://doi.org/10.1007/s00202-017-0624-1

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  • DOI: https://doi.org/10.1007/s00202-017-0624-1

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