.
...
..
..
-
.
---I-
..
.
_......
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
I
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)
I
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
I
Binarv
coded
decimal
IBCDI
I
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
74
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