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AN INTRODUCTION TO - page 40 / 72

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Other important conditions related to first Simulation:

  • a)

    SH-7 -> should always be on.

  • b)

    Point 101 and 102 should be always normal.

  • c)

    ‘A’ marker of S-12 should be lit since it is working in automatic mode. All other

signals are purely automatic. d) After some time all the signals will show clear aspect since they are working in automatic mode. An automatic signal sets the route by itself.

SIMULATION 2:

E M U through down main line. S1, S39 Manual, S/A 506 purely Automatic.

Initially S1, S39 will lie in automatic mode (‘A’ marker lit) & S/A 506 is a purely automatic (“A” plate) signal. The whole down track is set and hence all signals will be clear.S1 will be taken into manual by pressing main signal button and AGGB (red button). As a result the ‘A’ marker will be off. Similarly S39 is taken into manual.

After this the main signal button of S39 and the route button 39 are pressed simultaneously. As a result the path from the overlap of S39 up to the overlap of S/A 506 will be set and S39 will show clear aspect .This is actually done with the help of RRI (Route Relay Interlocking) but in our project microcontroller (89C51) will be responsible for it. Similarly the main signal button of S1 and the corresponding route button 01 are pressed simultaneously, the path from the overlap of S1 up to the overlap of S39 will be set and S1 will show clear aspect. After this the train arrives and the following events take place.

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