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

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 h...

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Bibliographic Details
Published in:Electrical engineering 2017-12, Vol.99 (4), p.1169-1178
Main Authors: Rástočný, Karol, Ždánsky, Juraj, Balák, Jozef, Holečko, Peter
Format: Article
Language:English
Subjects:
Actuators
Control systems
Diagnostic systems
Economics and Management
Electrical Engineering
Electrical Machines and Networks
Energy Policy
Engineering
Failure detection
Integrity
Original Paper
Power Electronics
Process controls
Programmable logic controllers
Safety
Sensors
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Summary: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.
ISSN:0948-7921
1432-0487
DOI:10.1007/s00202-017-0624-1