Detects assignments to variables which do not have any effect in the code.
Justification: When values are assigned to a variable multiple times without the variable being evaluated between assignments, the first assignments do not have any effect on the program.
Importance: Low
Example
PROGRAM PLC_PRG VAR dwVal1 : DWORD; dwVal2 : DWORD; END_VAR dwVal1 := 1; // unnecessary assignment IF dwVal2 > 100 THEN dwVal2 := 0; dwVal2 := dwVal2 + 1; END_IF dwVal1 := 2; --> SA0168: The variable 'dwVal1' is assigned but its value is never used.