Abstract
Programmable logic controllers (PLCs) are widely used in control applications. The growth of control requirements has created new challenges upon PLCs. Dependability attributes, like reliability and safety, became essential parameters in the PLC systems design. Since 90% of the PLC faults belong to its I/O modules, the dependability of the PLCs I/O modules represents a major issue.
“Classic” dependability analysis are based on the structure of I/O modules, which requires a distinct treatment of each type of I/O module at almost every step of the analysis. This chapter proposes another technique for analysing the dependability of PLC I/O modules. This technique is based on the mode in which the I/O modules fulfill their tasks and not on their structure. Such an approach allows a unified analysis of I/O modules, regardless of their type, for almost the entire analysis work. The particularization of the I/O module type becomes necessary only at the final stage of the analysis. There are realized qualitative & quantitative analysis of I/O modules dependability. For this, and because reliability is not an eloquent parameter in any situation, there are defined probabilistical parameters both for one I/O point and for I/O points systems. In addition, there are made comparisons between some I/O points configurations. Finally, there are proposed several architectures considered optimal and the processes for which they may be suitable.
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Gergely, E.I., Coroiu, L., Silaghi, H.M. (2013). Dependability Analysis of PLC I/O Systems Used in Critical Industrial Applications. In: Balas, V., Fodor, J., Várkonyi-Kóczy, A. (eds) New Concepts and Applications in Soft Computing. Studies in Computational Intelligence, vol 417. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-28959-0_12
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DOI: https://doi.org/10.1007/978-3-642-28959-0_12
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