User`s manual

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MELSEC-Q
2 STRUCTURE AND COMBINATIONS OF PROCESS CONTROL
INSTRUCTIONS
2.2.3 Double word (32-bit) data
Double word data is 32-bit numeric data.
• Decimal constant....................K-2147483648 to K2147483647
• Hexadecimal constant............H00000000 to HFFFFFFFF
When using double word data, specify the word device to be used in the lower-order 16 bits.
The 32-bit data is stored into the (specified word device number) and ((specified word device
number)
1).
Example) When D10 is specified for double word data, D10 and D11 are used.
D11 D10
(BW1) H (BW1) L
2.2.4 For real number data (floating-point data)
The data required for operations and the operation results are 32-bit floating-point data.
Floating-point data is displayed as follows using 2 word devices.
1. [Fixed-point part]
2 [Exponent part]
The bit configuration when the floating-point data is expressed internally and its meaning are as
follows.
b31 b30 to b23 b22 to b16 b15 to b0
b31
Fixed-point part sign
b23 to b30
Exponent part
b0 to b22
Fixed-point part
• Fixed-point part sign This shows the fixed-point part sign in b31.
0: Positive
1: Negative
• Exponent part This shows the 2
n
's n and b23 to b30.
The n from b23 to b30's BIN value is as follows.
b23 to b30 FF
H
FE
H
FD
H
81
H
80
H
7F
H
7E
H
02
H
01
H
00
H
n
Non-numeric
data
127
126
2
1
0
-1
-125
-126
Non-numeric
data
• Fixed-point part This shows the value of XXXXXX... in the 23 bits, b0 to b22, when 1.XXX
XXX... is represented in binary.
POINT
• The monitor function of GX Developer allows you to monitor the real number data of the
QnPHCPU.
• The real number setting range is 0,
2
-126
|value|
2
128
.
• To represent 0, set 0 in all of b0 to b31.