Component-Based Safety Computer of Railway Signal Interlocking System

Abstract

Computer is the vital element for safety-critical control system. This paper presents a component-based fail-safe computer in railway signal interlocking system (Safety interlock computer-SIC). We discuss the methodology and the safety tactics of SIC in detail, moreover, the architecture and safety computation principle are deeply analyzed. The hardware safety integrity level of SIC has been verified according to standard IEC 61508, and the result shows that SIL4 is achieved, and SIC fulfils the rigorous safety requirements of signal interlocking.2008 ISECS International Colloquium on Computing, Communication, Control, and Management 978-0-7695-3290-5/08 $25.00

An Overview of Current Challenges and Emerging Technologies to Facilitate Increased Energy Efficiency, Safety, and Sustainability of Railway Transport

“…This may be achieved by using a transmission code and safety code [140] along with different cryptographic techniques [141] to ensure the correctness of data transfer, which can be easily programmed within the NB-IoT node embedded microcontroller system. It is also critical that the latter possesses a fault-tolerant architecture [142], wherein using tried and tested hardware would also increase the microcontroller system reliability [143]. By using all of these measures, it would be possible to achieve a high SIL 4 level of the NB-IoT remote sensor node, which would be characterised by less than 10 −9 faults per hour (see discussions in [142,144]), which would be required to reliably monitor the integrity and safety required by the monitored systems [145].…”

“…It is also critical that the latter possesses a fault-tolerant architecture [142], wherein using tried and tested hardware would also increase the microcontroller system reliability [143]. By using all of these measures, it would be possible to achieve a high SIL 4 level of the NB-IoT remote sensor node, which would be characterised by less than 10 −9 faults per hour (see discussions in [142] and [144]), which would be required to reliably monitor the integrity and safety required by the monitored systems [145]. Naturally, a safety analysis should be performed at all operational stages of the equipment lifecycle [146].…”