Mitsubishi Electric MELSEC-Q/L - Conversion from Single Precision to Double Precision

6 BASIC INSTRUCTIONS
6.3 Data Conversion Instructions
295
6
Conversion from single precision to double precision
ECON(P)
Processing details
• Converts 32-bit floating-point real number specified for (S) into 64-bit floating-point real number, and stores the conversion
result to the device specified for (D).
• When an input value is set using a programming tool, a rounding error may occur. For precautions, refer to Page 89
Precautions.
Operation error
• In any of the following cases, an operation error occurs, the error flag (SM0) turns ON, and an error code is stored into SD0.
Program example
• The program which converts 32-bit floating-point real number of the devices, D10 to D11, into 64-bit floating-point real
number when X0 turns ON, and outputs the conversion result to the devices, D0 to D3.
(S): Conversion source data, or head number of the device where conversion source data is stored (Real number (single precision))
(D): Head number of the device where the converted data is stored (Real number (double precision))
Setting
data
Internal device R, ZR J\ U\G Zn Constant
E
Others
Bit Word Bit Word
(S)    
(D)    
Error
code
Error details Q00J/
Q00/
Q01
QnH QnPH QnPRH QnU LCPU
4140 (S) is -0, a subnormal number, NaN (not a number), , or a value outside
the following ranges.
0, 2
-126
|(S)| < 2
128

[Ladder Mode] [List Mode]
Universal LCPU
Basic
High
performance
Process Redundant
ECON
ECONP
S
D
S D
ECON
ECONP
Command
Command
+1
S S
32-bit floating-point real number
+3 +2
+1
DDD
D
64-bit floating-point real number
Step
Instruction
Device