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Lighting device parameters influence on signal circuit safety in interlocking systems

100%

Nagy P. , Ždánsky J.

Archives of Transport System Telematics

2010

tom Vol. 3, iss. 3

9-13

Signal circuits are an important part of the interlocking system. The main role of the signalling circuit is to switch the required signal aspects and signal checking. A signal is an interface between the interlocking system and a driver of the railway vehicle. Light bulbs are mostly used as a light source in most types of interlocking systems. It is possible to think about alternative light sources within the context of modernisation of the interlocking systems. The use of alternative light sources using must not cause signal circuit safety degradation. The article deals with problems of light bulbs replacement for another light source in AŽD 71 type relay interlocking in the Railways of Slovak Republic.

80%

Ždánsky J. , Rástočný K. , Hrbček J.

tom Vol. 4, iss. 3

43-49

Nowadays, there are available on the market not only standard PLCs (Programmable Logic Controller) but also safety PLC´s. These are primarily designed for industrial applications. Their guaranteed safety properties, however, enable to be used in applications, in which the usage of PLC has not been common until now. The aim of this article is to focus on problems related to the usage of safety PLC in railway signalling systems.