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Programmable Logic Controllers, 6th Edition by William Bolton

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Chapter 3

Digital Systems

Abstract

In this chapter the various number systems are looked at, namely denary, binary, octal, hexadecimal and binary coded decimal. Binary arithmetic is developed. Combinational and sequential logic systems are introduced.

Keywords

Denary

binary

octal

hexadecimal and binary coded decimal number systems

logic systems

Digital systems work with inputs, which are essentially just off/on signals, with the two signal levels represented by 0 and 1. These are termed binary digits. The number system used for everyday calculations is the denary or decimal system. This is based on the use of 10 digits: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9. With a number represented by this system, the digit position in the number indicates the ...

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