Numeric Value And Character Representation; Binary (Bin); Binary Coded Decimal (Bcd) - Mitsubishi MELSEC A1SCPU Handy Manual

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BIN Bit 10 Bit 9
bit
DEC 1024 512
value
:PROGRAMMING
Bit8 Bit7 Bit6
Bit 5
Bit4 Bit 3 Bit 2 Bit 1
Bit 0
256
128 64 32 16
8
4
2
1
umeric value and character representation
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DEC
0
1
2
3
4
All numeric values and characters are processed in binary (BIN) by the PLC CPU
with all data represented by two states, 0 and 1. The PLC CPU has conversion
functions between binary and decimal (DEC), and also between binary and
hexadecimal (HEX), therefore sequence programs can be written and operation
results monitored in decimal or hexadecimal. The A1
S
CPU can process both 16 bit
and 32 bit data,
BIN BCD
0 0
1 1
10 10
11 11
100
100
1
Binary (BIN)
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Binary represents numeric values as a series of 0's and 1's. After a 1, a carry
occurs when using the BIN system. Below is an example of decimal values
represented in binary, the shaded areas indicate where a carry has occurred.
BIN bits correspond to DEC values as indicated below:
Example: BIN value, 1100101
=
64 +
32
+ 4 + 1
=
DEC value, 101
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Binarv coded decimal IBCDI
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Binary coded decimal is a code for representing decimal numbers in a binary
format. in the BCD system a carry occurs after 9. Examples of corresponding DEC,
BIN, and BCD values are shown below
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