Specifications

4-30
4.4 Method for Specifying Data
4.4.4 Single-precision real/double-precision real data
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_D0Var_R100
Four points (64 bits) of R100, R101, R102, and R103 are the target word devices
Four points (64 bits) of D0, D1, D2, and D3
are the target word devices
Transfers real number data
b
63
b62
to
b52 b51 b16
to
b15 b0
to
b63
Sign
b52 to b62
Exponent
b0 to b51
Fraction
b52
to b627FF
H
7FEH 7FDH 400H 3FFH 3FEH 3FCH 02H 01H 00H
n
Not used
1023
1022
2 1
0
3FDH
-1
-2
-1021 -1022
Not used