3-14
3.4 Method for Specifying Data
3.4.4 Single-precision real/double-precision real data
(2) Double-precision real (double-precision floating-point data)
Devices used in lower 16 bits are specified for instructions that use real number data.
Real number data are stored in 64 bits of 'specified device number' and 'specified device
3'.
Remark
1) Floating-point data are represented by four word devices.
[Sign] 1. [Fraction] 2
[Exponent]
The following explains the bit configuration and its meaning when floating-point
data are internally represented.
• Sign
b63 represents a sign.
0: Positive
1: Negative
• Exponent
b52 to b62 represent n of 2
n
.
The values of n are as follows according to BIN values of b52 to b62.
• Fraction
52 bits of b0 to b51 represent a value of XXXXXX... when the fraction is
expressed as 1.XXXXXX... in binary.
M0
EDMOV
EN
ENO
d
Var_D0
Var_R
1
00
Four
p
oints (
6
4
b
its) o
f
R
1
00, R
1
0
1
, R
1
0
2
, and R
1
03 are t
h
e target
w
ord devices
Four
p
oints (
6
4
b
its) o
f
D0, D
1
, D
2
, and D3
are t
h
e target
w
ord devices
Trans
f
ers real num
b
er data
b6
3
b62
to
b52
b51
b16
to
b15
b
0
to
b6
3
Sign
b52
to
b62
Ex
p
onent
b
0 to
b51
Fraction
b52
to
b62
7FF
H
7FE
H
7FD
H
400
H
3FF
H
3FE
H
3FC
H
0
2
H
0
1
H
00
H
n
Not used
1
0
2
3
1
0
22
2
1
0
3FD
H
-
1
-
2
-
1
0
21
-
1
0
22
Not used
Содержание MELSEC Q Series
Страница 1: ...Structured Programming Manual Mitsubishi Programmable Controller QCPU Common Instructions ...
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