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Numerical Values Usable in Sequence Program
3
SEQUENCE PROGRAMMING
3.8.1 BIN (Binary Code)
(1) Binary code
BIN is a numerical value represented by 0s (OFF) and 1s (ON).
In the decimal code, a number is incremented from 0 to 9, and at this point, a
carry occurs and the number is incremented to 10.
In BIN, 0, 1 are followed by a carry, and the number is incremented to 10 (2 in
decimal).
Table 2.2 indicates the numerical representations of BIN and decimal code.
Table 3.2 Differences between Numerical
Representations of BIN and Decimal Code
(2) Numerical representation of BIN
1) Each register (e.g. data register) of the built-in PLC function consist of 16 bits.
Each bit of the register is assigned a 2
n
value.
However, the most significant bit is used to judge whether the value is positive
or negative.
• Most significant bit is 0 ..... Positive
• Most significant bit is 1 ..... Negative
The numerical representation of each register of the built-in PLC function is
shown in Fig. 2.8.
Fig 3.9 Numerical Representation of Each Register of Built-in PLC Function
2) Numerical data usable with the built-in PLC function
In the numerical representation shown in Fig. 2.8, values can be represented in
DEC (Decimal Code) BIN (Binary Code)
00000
10001
20010
3 0011
40100
50101
60110
70111
81000
91001
10 1010
11 1011
Carry
Carry
Carry
Value is negative if most significant bit is 1.
b15 b14 b13 b12 b11 b10 b9 b8 b7 b6 b5 b4 b3 b2 b1 b0
Most significant bit (for judgment of positive/negative)
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
2
15
16384
8192
4096 2048 1024
512 256 128 64 32 16 8 4 2 1
-32768
Bit name
Decimal value
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