Appendix
B
B1
Number Systems
There are four numbering systems used with programmable controllers.
They are:
Decimal
Octal
Binary
Hexadecimal
These numbering systems differ by their number sets and place values.
The decimal numbering system uses a number set made up of ten digits:
the numbers 0 through 9. All decimal numbers are composed of these
digits. The value of a decimal number depends on the digits used and the
place value of each digit.
Each place value in a decimal number represents a power of ten
(Figure B.1), starting with 100. The value of a decimal number is
determined by multiplying each digit by its corresponding place value and
adding these numbers together.
Figure B.1
Decimal
Numbering System
239
2 x 10
1
=
200
10
3 x 10
1
= 30
10
9 x 10
0
= 9
10
200
30
9
239
10
10
B.0
General
B.1
Decimal Numbering System
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