2. Types of Methods applied in software for Interlocking
2.1 Geographical Method:
In the Geographical method the input to the SSI is given as the position of the signals, points, tracks Circuits and Slots. The Interlocking is implemented based on the generic rules that no part of the track are shared by the two routes at a time, Conflicting routes should not be set at a time etc. This type of implementation requires a great knowledge of the Yard Elements and the interconnection between them. In this method the software does not have one to one relation ship to the relay circuits used for RRI and is very difficult validate, so this method has failed to create the necessary confidence in the railway operators
2.2 Boolean Equation Method:
The Boolean equation method is the implementation of the traditional relay interlocking principles. In this method the relay circuits are implemented as Boolean equations, so there is one to one relation ship between the relay circuits and the software variables. Since there is a one to one relation ship between the software and the RRI Relay circuits, Railway operator can easily validate the software entrees made and this method will give him sufficient confidence.
2.1 Geographical Method:
In the Geographical method the input to the SSI is given as the position of the signals, points, tracks Circuits and Slots. The Interlocking is implemented based on the generic rules that no part of the track are shared by the two routes at a time, Conflicting routes should not be set at a time etc. This type of implementation requires a great knowledge of the Yard Elements and the interconnection between them. In this method the software does not have one to one relation ship to the relay circuits used for RRI and is very difficult validate, so this method has failed to create the necessary confidence in the railway operators
2.2 Boolean Equation Method:
The Boolean equation method is the implementation of the traditional relay interlocking principles. In this method the relay circuits are implemented as Boolean equations, so there is one to one relation ship between the relay circuits and the software variables. Since there is a one to one relation ship between the software and the RRI Relay circuits, Railway operator can easily validate the software entrees made and this method will give him sufficient confidence.
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