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A Look at Solid State Interlocking
With
this in the back ground let us try to configure a Solid State Interlocking
System using the standard structure of a modern computer. For the sake of
completing the analogy let us assume that the computer is fail-safe but
includes plug and play concept of the present day operating systems.
If this
is a plug and play computer on connection of the external devices it would be
detecting the device and the OS would recognize the device and use appropriate
driver to work the device. If
no interlocking intelligence is inbuilt in the failsafe hardware then the OS can
be allowed to perform tasks as very basic rules of signaling like if the point
track circuit is occupied the relevant point machine will not the worked. Or
when a signal is passed by a train
and the track is dropped beyond the signal the signal should go back to danger.
At this level the big picture that of route locking and its release etc should
not be available.
The
application software now takes up the last piece of the activity like that of
route locking , release, emergency operations etc. as are required. The
application can take care of bypasses to rules etc as required.
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