Abstract for programmable logic controller

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MOSFETs is simpler and more efficient than the sum of the individual gates. In reversible logic, Toffoli gates are used. Exactly the same as diode logic but can perform at a higher speed. Uses neon bulbs or 3 element neon trigger tubes to perform logic.

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Performed by semiconductor diodes and small ferrite toroidal cores for moderate speed and moderate power level. Uses thyristors and SCRs to perform logic operations where high current and or high voltages are required. Uses transistors switching between saturated and cutoff states to perform logic. The transistors require carefully controlled parameters.