Mitsubishi MELSEC Q Series Programming Manual page 99

• Variable part
binary 1.XXXXXX....
(2) Double-precision floating-point data
Instructions which deal with double-precision floating-point datadesignate devices which are
used for the lower 16 bits of data.
Double-precision floating-point data are stored in the 64 bits which make up (designated
device number) to (designated device number + 3).
M0
EDMOV R100
Remark
In sequence programs, floating decimal point data are designated by E
Double-precision floating-point data uses four word devices and is expressed
in the following manner:
[Sign] 1. [Mantissa part]
The bit configuration and meaning of the internal representation of double-
precision floating-point data is as follows:
b63 b62
b63 b52 to b62
Exponent part
Sign
• Sign The sign is represented at b63.
0: Positive
1: Negative
• Exponent part The n of 2n is represented from b52 to b62.
Depending on the BIN value of b52 to b62, the value of n is as follows:
b52 to b62 7FF 7FE
H H
n
Not used 1023 1022
• Variable part
binary 1.XXXXXX....
The 23 bits from b0 to b22, represents the XXXXXX... at
D0
[Exponent part]
2
to b52 b51 to b16
7FD 400
3FF
H H H
2
1
The 52 bits from b0 to b51, represents the XXXXXX... at
Designation of 4 points of word devices D0, D1, D2
and D3 (64 bits)
Designation of 4 points of R100, R101, R102 and
R103 (64 bits)
Double-precision floating-point data transfer
instruction
b15 to
b0 to 51
Mantissa part
3FE 3FD 3FC 02
H H H
2
0 1
3
4
4
6
.
7
8
b0
01 00
H H H
1022 Not used
1021
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