Conversion instructions
143
Part II IEC Instructions
STRING_TO_DWORD
STRING (Hexadecimal Format) to DOUBLE WORD
At first the string is converted to a value of the data type STRING[32]. Finally this is converted to a
value of the data type DWORD in a subprogram of approximately 270 steps, which is also used by
the functions STRING_TO_INT, STRING_TO_WORD, STRING_TO_DINT and
STRING_TO_DWORD.
To add an enable input and enable output to the instruction, select [With EN/ENO] from the
"Instructions" pane (LD, FBD or IL editor). To reuse an instruction select "Recently used" from the
context menu or press <Ctrl>+<Shift>+<v> in the programming window.
See also: STRING_TO_DWORD_STEPSAVER
Example with and without EN/ENO:
Acceptable Format:
_'[Space][Hexadecimal number][Space]' e.g. perhaps ' afFE '
Acceptable characters:
Space Space “ “
Signs Plus "+“ and minus "-"
Hexadecimal
numbers
Hexadecimal numbers in the range "0 - 9“ or "A - F“ or "a - f".
The analysis ends with the first non-hexadecimal number.
PLC types
Availability of STRING_TO_DWORD (see page 1331)
Data type Comment
STRING Input variable
DWORD Output variable
Description
This function converts a string in hexadecimal formal to a value of the data type DWORD.
Data types
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