Digital input for a programmable logic controller

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United States of America Patent

PATENT NO 8912935
SERIAL NO

14141291

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Abstract

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A digital input includes a galvanically isolated section having an integrating capacitor coupled to a high voltage signal input by at least one current-limiting resistor, a relaxation oscillator coupled across the integrating capacitor, and an electronic switch controlled by the relaxation oscillator. An optical isolator has an input side and an output side, wherein the input side is coupled across the integrating capacitor by the switch, and a low voltage section includes a decoder having an input coupled to the output side of the optical isolator and having a low voltage signal output.

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Patent Owner(s)

  • MAXIM INTEGRATED PRODUCTS, INC.

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Smith, Douglas S Milpitas, US 13 74

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