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5.1 Type Conversion Functions
5.1.17 Single-precision real type 
double-precision real type conversion
5-47
5
APPLICATION 
FUNCTIONS
REAL_TO_LREAL(_E)
REAL_TO_LREAL(_E)
5.1.17  
Single-precision real type  double-precision real type 
conversion
REAL_TO_LREAL(_E)
Function
Operation processing
(1) Converts single-precision real type data input to   into double-precision real type data, and 
outputs the operation result from  .
(2) Rounding error may occur when specifying the input value to   by programming tool.
For the precautions on setting the input value by the programming tool, refer to 
MELSEC-Q/L/F Structured Programming Manual (Fundamentals).
REAL_TO_LREAL(_E)
_E: With EN/ENO
indicates any of the following 
functions.
REAL_TO_LREAL
REAL_TO_LREAL_E
Input argument,
EN:
Executing condition (TRUE: Execution, FALSE: Stop)
:Bit
s(_REAL):
Input
:Single-precision real
Output argument,
ENO:
Execution result (TRUE: Normal, FALSE: Error)
:Bit
d:
Output
:Double-precision real
Universal
LCPU
Basic
High
performance
Process
Redundant
EN
ENO
d
s
(EN, s, d);
ENO:=
Structured ladder/FBD
ST
REAL_TO_LREAL_E
REAL_TO_LREAL_E
s
d
Single-precision real type
1234.0
Double-precision real type
1234.0
s
d
s
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5-48
5.1 Type Conversion Functions
5.1.17 Single-precision real type 
double-precision real type conversion
REAL_TO_LREAL(_E)
Operation result
(1) Function without EN/ENO
The following table shows the operation results.
(2) Function with EN/ENO
The following table shows the executing conditions and operation results.
*1: When FALSE is output from ENO, the data output from   is undefined.
In this case, create a program so that the data output from   is not used.
Operation result
No operation error
Operation output value
Operation error
Undefined value
EN
ENO
TRUE (Operation execution)
TRUE (No operation error)
Operation output value
FALSE (Operation stop)
FALSE
*1
Undefined value
d
d
d
d
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5.1 Type Conversion Functions
5.1.17 Single-precision real type 
double-precision real type conversion
5-49
5
APPLICATION 
FUNCTIONS
REAL_TO_LREAL(_E)
REAL_TO_LREAL(_E)
Operation Error
An operation error occurs in the following cases.
• The input value is -0 or outside the following range.
(Error code: 4140)
0, 2
-126
|     |
2
128
• The operation result is outside the following range (an overflow occurrence). 
(Error code: 4141)
2
1024
| operation result |
Program Example
The program which converts single-precision real type data input to   into double-precision real 
type data, and outputs the operation result from  .
(a) Function without EN/ENO (REAL_TO_LREAL)
[Structured ladder/FBD]
[ST]
g_lreal1:= REAL_TO_LREAL(g_real1);
(b) Function with EN/ENO (REAL_TO_LREAL_E)
[Structured ladder/FBD]
[ST]
g_bool3 := REAL_TO_LREAL_E(g_bool1, g_real1, g_lreal1);
s
s
d
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5-50
5.1 Type Conversion Functions
5.1.18 Double-precision real type 
single-precision real type conversion
LREAL_TO_REAL(_E)
5.1.18  
Double-precision real type  single-precision real type 
conversion
LREAL_TO_REAL(_E)
Function
Operation processing
(1) Converts double-precision real type data input to   into single-precision real type data, and 
outputs the operation result from  .
(2) Rounding error may occur when setting the input value to   by programming tool.
For the precautions on setting the input value by the programming tool, refer to MELSEC-Q/
L/F Structured Programming Manual (Fundamentals).
LREAL_TO_REAL(_E)
_E: With EN/ENO
indicates any of the following 
functions.
LREAL_TO_REAL
LREAL_TO_REAL_E
Input argument,
EN:
Executing condition (TRUE: Execution, FALSE: Stop)
:Bit
s(_LREAL): Input
:Double-precision real
Output argument,
ENO:
Execution result (TRUE: Normal, FALSE: Error)
:Bit
d:
Output
:Single-precision real
Universal
LCPU
Basic
High
performance
Process
Redundant
EN
ENO
d
s
(EN, s, d);
ENO:=
Structured ladder/FBD
ST
LREAL_TO_REAL_E
LREAL_TO_REAL_E
s
d
Double-precision real type
Single-precision real type
1234.0
1234
s
d
s
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5.1 Type Conversion Functions
5.1.18 Double-precision real type 
single-precision real type conversion
5-51
5
APPLICATION 
FUNCTIONS
LREAL_TO_REAL(_E
)
LREAL_TO_REAL(_E)
Operation result
(1) Function without EN/ENO
The following table shows the operation results.
(2) Function with EN/ENO
The following table shows the executing conditions and operation results.
*1: When FALSE is output from ENO, the data output from   is undefined.
In this case, create a program so that the data output from   is not used.
Operation result
No operation error
Operation output value
Operation error
Undefined value
EN
ENO
TRUE (Operation execution)
TRUE (No operation error)
Operation output value
FALSE (Operation stop)
FALSE
*1
Undefined value
d
d
d
d
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5-52
5.1 Type Conversion Functions
5.1.18 Double-precision real type 
single-precision real type conversion
LREAL_TO_REAL(_E)
Operation Error
An operation error occurs in the following cases.
• The input value is -0 or outside the following range.
(Error code: 4140)
0, 2
-1022
|     |
2
1024
• The operation result is outside the following range (an overflow occurrence).
(Error code: 4141)
2
128
| operation result |
Program Example
The program which converts double-precision real type data input to   into single-precision real 
type data, and outputs the operation result from  .
(a) Function without EN/ENO (LREAL_TO_REAL)
[Structured ladder/FBD]
[ST]
g_real1:= LREAL_TO_REAL(g_lreal1);
(b) Function with EN/ENO (LREAL_TO_REAL_E)
[Structured ladder/FBD]
[ST]
g_bool3 := LREAL_TO_REAL_E(g_bool1, g_lreal1, g_real1);
s
s
d
5.1 Type Conversion Functions
5.1.19 Single-precision real type 
string type conversion
5-53
5
APPLICATION 
FUNCTIONS
REAL_TO_STR(_E)
REAL_TO_STR(_E)
5.1.19  
Single-precision real type  string type conversion
REAL_TO_STR(_E)
Function
Operation processing
(1) Converts single-precision real type data input to   into string type (exponential form) data, 
and outputs the operation result from  .
This function is used in the Basic model QCPU with a serial number (first five digits) of "04122" or later.
REAL_TO_STR(_E)
_E: With EN/ENO
indicates any of the following 
functions.
REAL_TO_STR
REAL_TO_STR_E
Input argument,
EN:
Executing condition (TRUE: Execution, FALSE: Stop)
:Bit
s(_REAL): Input
:Single-precision real
Output argument,
ENO:
Execution result (TRUE: Normal, FALSE: Error)
:Bit
d:
Output
:String(13)
Basic
Process
High
performance
Redundant
Universal
LCPU
Ver.
EN
ENO
d
s
REAL_TO_STR_E
(EN, s, d);
ENO:=
Structured ladder/FBD
ST
REAL_TO_STR_E
s
d
Sign
(integer part)
Sign
(exponent part)
Single-precision 
real type
00
H
(NUL)
String  1st word
2nd word
3rd word
4th word
5th word
6th word
7th word
High-order byte
Low-order byte
20
H
(space)
2E
H
(.)
ASCII code of 
two decimal place
ASCII code of 
four decimal place
45
H
(E)
ASCII code of
exponent part's
tens place
Sign data
(integer part)
ASCII code of
integer part
ASCII code of
one decimal place
ASCII code of
three decimal place
Sign data
(exponent part)
When SM701 (signal for switching the number of output character) is OFF,
"00
H
" is stored.
Automatically 
added.
E
.
s
d
ASCII code of
five decimal place
ASCII code of
exponent part's
units place
5-54
5.1 Type Conversion Functions
5.1.19 Single-precision real type 
string type conversion
REAL_TO_STR(_E)
(2) The character string data after conversion is output from output variable   in the following 
manner.
(a) The number of digits is fixed respectively for the integer part, fractional part, and 
exponent part. (Integer part: 1 digit, fractional part: 5 digits, exponent part: 2 digits)
'20
H
' (space), '2E
H
' (.) and '45
H
' (E) are automatically stored in the 2nd, 4th and 10th 
bytes, respectively.
(b) '20H' (space) is stored in 'Sign data' (integer part) when the input value is positive; '2DH' 
() is stored when negative.
(c) Fractional part is rounded to 5 decimal places.
(d) If the number of significant figures is less, '30
H
' (0) is stored to fractional part.
(e) '2B
H
' (+) is stored in the 'Sign data' (exponent part) if the exponent is positive; '2D
H
' () 
is stored when negative.
(f) '30
H
' (0) is stored to tens place in the exponent part if exponent part has only one digit.
(3) When SM701 (signal for switching the number of output characters) is OFF, "00
H
" is stored 
to the end of the character string (7th word).
(4) Rounding error may occur when specifying the input value to   by programming tool.
For the precautions on setting the input value by the programming tool, refer to 
MELSEC-Q/L/F Structured Programming Manual (Fundamentals).
d
Single-precision real type
-12.3456
2E
H
(.)
45
H
(E)
All together 13 digits
Fractional part (5 digits)Exponent part (2 digits)
Integer part (1 digit)
1 . 2 2 3 3 4 4 5
-
6 E + 0
1
s
d
20
H
(space)
Single-precision real type
-12.345678
Rounded off.
All together 13 digits
Fractional part (5 digits)
s
d
1 . . 2 2 3 3 4 5
-
66
7
7 8 E + 0
1
Single-precision real type
-12.34
Fractional part (5 digits)
30
H
(0)
All together 13 digits
s
d
1 . 2 2 3 3 4 4 0
-
0 E + 0
1
Single-precision real type
-12.3456
30
H
(0)
All together 13 digits
Exponent part (2 digits)
s
d
1 . 2 2 3 3 4 4 5
-
6 E + 0
1
s
5.1 Type Conversion Functions
5.1.19 Single-precision real type 
string type conversion
5-55
5
APPLICATION 
FUNCTIONS
REAL_TO_STR(_E)
REAL_TO_STR(_E)
Operation result
(1) Function without EN/ENO
The following table shows the operation results.
(2) Function with EN/ENO
The following table shows the executing conditions and operation results.
*1: When FALSE is output from ENO, the data output from   is undefined.
In this case, create a program so that the data output from   is not used.
Operation result
No operation error
Operation output value
Operation error
Undefined value
EN
ENO
TRUE (Operation execution)
TRUE (No operation error)
Operation output value
FALSE (Operation stop)
FALSE
*1
Undefined value
d
d
d
d
5-56
5.1 Type Conversion Functions
5.1.19 Single-precision real type 
string type conversion
REAL_TO_STR(_E)
Operation Error
An operation error occurs in the following case.
• The input value is outside the range of -3.40282
+38 
to -1.17549
-38
, 0 or 1.17549
-38
to 
3.40282
+38
(Error code: 4100)
Program Example
The program which converts single-precision real type data input to   into string type 
(exponential form) data, and outputs the operation result from  .
(a) Function without EN/ENO (REAL_TO_STR)
[Structured ladder/FBD]
[ST]
g_string1:= REAL_TO_STR(g_real1);
(b) Function with EN/ENO (REAL_TO_STR_E)
[Structured ladder/FBD]
[ST]
g_bool3 := REAL_TO_STR_E(g_bool1, g_real1, g_string1);
s
d
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