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Type
| Function |
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Description
| The overloaded function TO_BOOL converts an input value of various data types into an output value of the data type BOOL (see description of the input for the supported data types). |
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Parameters
| Input
 IN
| Data type: | The function is available for the following input data types:
- BYTE, WORD, DWORD and LWORD
- Integers: SINT, INT, DINT, LINT, USINT, UINT, UDINT and ULINT
- Floating point numbers: REAL, LREAL
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Output
OUT
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Conversion rules
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- Conversion of numeric data types - The input value 0 results in the output value FALSE. For any input value unequal to 0, the value TRUE is stored in the Boolean output variable.
- Conversion of bit data types - The data type conversion is done as binary transfer. The rightmost bit of the input value is stored in the Boolean output value (value 0 of the rightmost bit results in FALSE and 1 results in TRUE).
- For an input value that is not a real number (NaN) or a positive (Inf+) or negative infinity (Inf-) value, the value TRUE is returned.
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Additional information
| EN/ENO behavior
The POU is only executed if TRUE is applied to the EN input. If EN = FALSE, the POU is not executed and ENO = FALSE indicates the inactivity.
Note
ENO stays TRUE for an input value that is not a real number (NaN) or a positive (Inf+) or negative infinity (Inf-) value (see the conversion rules above). |
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