SA0168: Unnecessary Assignments

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

PROGRAM PLC_PRG
VAR
    dwVal1 : DWORD;
    dwVal2 : DWORD;
END_VAR

// unnecessary assignment
dwVal1 := 1;                            
IF  dwVal2 > 100 THEN
    dwVal2 := 0;
    dwVal2 := dwVal2 + 1;
END_IF
dwVal1 := 2;