Solid State Interlocking
More on solid state Electronics
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Once this logic is understood as required for a yard the implementation using a computer based system becomes quite simple. The critical item however is the need to ensure high level of availability and safety as any failure of the system should not lead to clearance of a signal when the logic as explained is no longer being satisfied. To ensure this any system of Solid State Interlocking tends to adopt redundant processing of the information and then comparison of the results of processing. Only when the result of multiple processing matches with each other and the result is a accepted clearance of signal then only the Solid State Interlocking system send command for clearance of a signal or move a switch.
The multiple processing can take various shape as
a) Multiple processors
b) Logic implemented in several different arguments
c) Independent processing of the inputs
Different manufacturers use different methods of multiple processing and different implementation techniques . The input to all such systems and the nature of output required for such systems continue to be all the same.
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