Equipments (Devices) > PLC200 > Program > Conversion > DWORD > STRING_TO

Block that performs the conversion of a STRING value into a DWORD value.

Ladder Representation

Block Structure

Variable Type	Name	Data Type	Description
VAR_INPUT	EN	BOOL	Block enabling
VAR_INPUT	STR	STRING	Value in STRING
VAR_OUTPUT	DONE	BOOL	End of operation
VAR_OUTPUT	OUT	DWORD UDINT DINT	Value in DWORD

Operation

When this block has a TRUE value in EN, it reads the value of STR as STRING character by character, performing the conversion to REAL and storing in OUT. If the first character is not mathematically valid, the OUT output receives zero. If there are valid characters, these characters will be converted to the end of STRING, or until it finds an invalid character.

NOTE!

If the number represented in the string is higher than the maximum supported by a DWORD, the Result value saturates in this maximum value.

When EN has FALSE value, OUT remains unchanged and DONE remains FALSE.

The DONE value forwards to the next Ladder block the EN value after the operation is completed.

Compatibility

Device	Version
PLC300	2.10 or higher

Block Flowchart

STRING_TO_DWORD_flowchart

Example in Ladder

The following examples show various conversions of STRING into values of DWORD type. All conversions enable the DONE output to the end of the operation.

STRING_TO_DWORD_example01

The conversion above was successfully completed.

STRING_TO_DWORD_example02

The conversion above was successfully completed. The underscore is a valid mathematical character.

STRING_TO_DWORD_example03

The conversion above was successfully completed. The decimal point is not mathematically valid for decimals and ends the conversion, truncating the result to what had already been converted.

STRING_TO_DWORD_example04

The conversion above was not successfully completed. The first character was not identified as mathematically valid, and the output was zeroed.

Example in ST

The example below displays the instructions for applying the example above in the ST language.

VAR

STR : STRING := 'A290';

OUT : DINT;

END_VAR

OUT := FB_STRING_TO_DWORD(EN:=DI1, STR:=STR, DONE=>DO1);