Count Up/Down
The Count register (C) is incremented, one step at a time, until its value is a maximum '111'. It is then decremented back down to zero '000'. The Count register ramps up and down in a continuous cycle.
The overflow line from each Counter sends the train to the other function to reverse the Count process.
This circuit comprises a Count Up and a Count Down function. No need to clear points, just run!
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| Click layout to pause/run train | Click points to switch 0/1 | Click start circle to reset train/points |
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Lazy points switch between upper 0 or lower 1 branch lines Trains arriving on a branch line switch the point to that line |
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Sprung points allow branch line trains to join the main line All main line trains go straight ahead and never 'branch off' |
Operation
- Start train running from station.
- The Count register will increase (count up) and then decrease (count down), one step at a time.
Linked Functions
Note that the points in the two registers are linked together vertically. Linking points allows data to be shared between the Count Up and the Count Down functions.