Mitsubishi Electric MELSEC Q Series Structured Programming Manual page 54

Fundamentals
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Remark
b52 to b62
4.4 Method for Specifying Data
4-30
4.4.4 Single-precision real/double-precision real data
M0
EDMOV
EN
ENO
d
Var_R100
Four points (64 bits) of R100, R101, R102, and R103 are the target word devices
1) Floating-point data are represented by four word devices.
[Sign] 1. [Fraction] 2
The following explains the bit configuration and its meaning when floating-point
data are internally represented.
b63
b62
to
b63
b52 to b62
Exponent
Sign
• Sign
b63 represents a sign.
0: Positive
1: Negative
• Exponent
b52 to b62 represent n of 2
The values of n are as follows according to BIN values of b52 to b62.
7FF
7FE
7FD
H
H
H
n
Not used 1023 1022
• Fraction
52 bits of b0 to b51 represent a value of XXXXXX... when the fraction is
expressed as 1.XXXXXX... in binary.
Transfers real number data
Var_D0
Four points (64 bits) of D0, D1, D2, and D3
are the target word devices
[Exponent]
b52
b51
to
b16
n
.
400
3FF
3FE
H
H
H
2
1
0
b15
to
b0 to b51
Fraction
3FD
3FC
02
H
H
H
-1
-2
-1021 -1022
b0
01
00
H
H
Not used

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