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Appendix 3
Data Used in the CPU Module
In the CPU module, data such as numeric values and alphabets are represented as a series of bits, "0" and "1". This
notation is called BIN (binary).
In addition, DEC (decimal), HEX (hexadecimal), BCD (binary-coded decimal), and floating-point data are available.
(1) BIN (binary code)
BIN is a data notation where a value is represented as a series of bits "0" and "1". Each place digit is shifted to the
higher digit when the value exceeds 1.
The value ranged from -32768 to 32767 can be stored in the CPU module.
(2) DEC (decimal)
DEC represents binary data of the CPU module in decimal notation. (
Page 275, Section 6.2
)
(3) HEX (hexadecimal)
HEX represents binary data of the CPU module in hexadecimal notation. (
Page 276, Section 6.3
)
In hexadecimal notation, four bits are handled as one digit. Because the place value in a digit is from 0 to 15 in
decimal notation, a value larger than nine is represented by A, B, C, D, E, or F. When the value is larger than F,
the digit is shifted to the higher digit.
This notation is useful when using 16-bit devices such as the data register and link register.
(4) BCD (binary-coded decimal)
BCD is a data notation that represents a value in the ones place of a decimal number in a binary number. As with
hexadecimal notation, data are represented in four bits but the alphabets A to F are not used. This notation is
useful when handling data from external devices, such as digital switches.
(5) Floating-point data
In floating point data, real number data are handled as a numeric value with the decimal point. The single-
precision floating-point data and double-precision floating-point data are available. (
Page 276, Section 6.4
)
b15
8192
Bit name
Bit weight
Most significant bit (for determination of positive/negative value)
A value is negative when the most significant bit is "1".
16384 4096 2048 1024 512 256 128 64 32 16 8 4 2 1 -32768
2
15
2
14
2
13
2
12
2
11
2
10
2
9
2
8
2
7
2
6
2
5
2
4
2
3
2
2
2
1
2
0
b14 b13 b12 b11 b10 b9 b8 b7 b6 b5 b4 b3 b2 b1 b0
Decimal value