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V260 Decrementing High Speed Counter ?

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High speed couters in my history count up. Im not sure what the end goal is, but if you need to for example show a decreasing value down to zero you can take the total value and subtract, then show this value on screen. For example when I have written programs for wire cutting machines in the past I can chose to either count up as the encoder spins till I meet the customers length then make a cut, or I can count down from the wanted length to zero then make the cut. After the cut I reset to either zero or the maximum value and do it all over again.

If the goal is to know if something is spinning forwards or backwards (and how far it went) then you will need a quadrature encoder that will allow you know what direction you are turning and you will add in one direction and subtract in the other. In any case make sure you do not compare a high speed input value using an equals function block you should always use a greater than or equals or a less than or equals.



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