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Programmable Logic Controller ---- Analog Values
Author: Eugene Kowch

Programmable Logic Controllers (PLC) can not deal directly with varying voltage levels. In order for an analog voltage or current to be used by a PLC, a circuit called an Analog-to-Digital Converter (ADC) or a PLC analog input module is used. This circuit accepts a voltage or current that is designed to fall within a given range and converts that value into a binary representation that is suitable for use by the PLC.

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