General Idea

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Digital Value - D

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The value shown as number such as 0, 1, 2 and 3, and varied non-continuously is called digital value. ON signal and OFF signal are shown as the digital value of 0 and 1. BCD values and binary values are also digital values.
To operate with digital values, analog values cannot be inputted directly to a CPU module.
Therefore, analog values are to be converted to digital values like Picture 1.4, and to be inputted to a CPU. To output analog values, it is necessary to convert the digital values in a CPU to analog values.