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SA0133: Explicit narrowing conversionsdl-permalink__symbolPermalink

Detects explicit conversions from a larger data type to a smaller data type

Justification: A large number of type conversions may indicate that you have chosen the wrong data types for variables. For this reason, there are programming guidelines that require an explicit justification for data type conversions.

Importance: Low

Example

PROGRAM SA0133
VAR	
	siVar:SINT;
	diVar:DINT;
	liVar:LINT;
	byVar:BYTE;
	uiVar:UINT;
	dwVar:DWORD;
	lwVar:LWORD;
	rVar:REAL;
	lrVar:LREAL;
END_VAR
siVar := LINT_TO_SINT(liVar);     // SA0133
byVar := DINT_TO_BYTE(diVar);	 // SA0133
siVar := DWORD_TO_SINT(dwVar);	// SA0133
uiVar := LREAL_TO_UINT(lrVar);	// SA0133
rVar := LWORD_TO_REAL(lwVar);	 // SA0133

--> SA0133: Explicit narrowing conversion from type 'LINT' to type 'SINT'
--> SA0133: Explicit narrowing conversion from type 'DINT' to type 'BYTE'
--> SA0133: Explicit narrowing conversion from type 'DWORD' to type 'SINT'
--> SA0133: Explicit narrowing conversion from type 'LREAL' to type 'UINT'
--> SA0133: Explicit narrowing conversion from type 'LWORD' to type 'REAL'