WORD_TO_LREALEX
The conversion of unsigned numbers into floating point numbers of the type LREAL is not supported in TwinCAT 2 on the ARM platform. Unsigned numbers with the highest significant bit set may possibly be implicitly converted into negative floating point numbers. The function described here allows the explicit conversion of the type WORD into a positive floating point number of the type LREAL in TwinCAT 2 (even if the highest significant bit was set and without compiler warning). You only need this function in order to be able to compile converted TwinCAT 2 projects without changes in TwinCAT 3.
Unsigned numbers of the type WORD are always (implicitly and explicitly) converted into positive floating point numbers in TwinCAT3. For this reason this function can be dispensed with.
FUNCTION WORD_TO_LREALEX: LREAL
VAR_INPUT
VAR_INPUT
in : WORD;
END_VAR
Sample:
PROGRAM MAIN
VAR
nWord : WORD := 16#FFFF;
fLreal : LREAL := 0.0;
END_VAR
fLreal value | Tc2.x ARM | Tc2.x X86 | Tc3.x ARM, X86, X64 |
---|---|---|---|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
*Conversion of unsigned integer to LREAL is not supported. The value is used as signed instead.
Requirements
Development environment |
Target platform |
PLC libraries to be integrated (category group) |
---|---|---|
TwinCAT v3.1.0 |
PC or CX (x86, x64, ARM) |
Tc2_Utilities (System) |