Delta AH500 - 2.2 Specifications and Functions; 2.2.1 Specifications

Chapter 2 Devices
2-7
The decimal number in the PLC is used as
 the setting value of the timer (T) or the setting value of the counter (C/HC). For example,
TMR C0 50 (constant K).
 the device number. For example, M10 and T30 (device number)
 as the number before or after the decimal point. For example, X0.0, Y0.11, and D10.0
(device number).
 the constant K: It is used as the operand in the applied instruction. For example, MOV 123
D0 (constant K).
3. Binary-coded decimal (BCD)
A decimal value is represented by a nibble or four bits, and therefore sixteen consecutive bits
can represent a four-digit decimal value.
4. Hexadecimal number (HEX)
The hexadecimal number in the PLC is used as
 the constant 16#: It is used as the operand in the applied instruction. For example, MOV
16#1A2B D0 (hexadecimal constant).
The following is the reference table:
Binary number
(BIN)
Decimal number
(DEC)
Binary-coded decimal number
(BCD)
Hexadecimal number
(HEX)
Internal operation
in the PLC
Decimal constant,
device number
Instruction related to the
binary-code decimal number
Hexadecimal
constant,
device number
0000
0
0000
0
0001
1
0001
1
0010
2
0010
2
0011
3
0011
3
0100
4
0100
4
0101
5
0101
5
0110
6
0110
6
0111
7
0111
7
1000
8
1000
8
1001
9
1001
9
1010
10
-
A
1011
11
-
B
1100
12
-
C
1101
13
-
D
1110
14
-
E
1111
15
-
F
10000
16
0001 0000
10
10001
17
0001 0001
11
2.2.2 Floating-point Numbers
The floating-point numbers are represented by decimal points in ISPSoft. For example, the
floating-point number of 500 is 500.0.
2.2.2.1 Single-precision Floating-point Numbers
The floating-point number is represented by the 32-bit register. The representation adopts the
IEEE754 standard, and the format is as follows.