Detects statements with possible loss of decimal places
Justification: A piece of code of the following type (diTemp2 := 1 rTemp1 := TO_REAL(diTemp2 / DINT#2)) can cause a misinterpretation. The author or reader of this line of code can assume
that the division would be performed as a REAL operation, and in this case the result would be REAL#0.5. However, this is not true. It is an integer operation. The result is cast to REAL and rTemp1 gets the value REAL#0. To avoid this, use a cast to make sure that the operation is performed as a REAL operation: rTemp1 := TO_REAL(diTemp2) / REAL#2.
Importance: Medium
Example
PROGRAM PLC_PRG VAR rTemp1 : REAL; diTemp2 : DINT; liTemp3 : LINT; END_VAR diTemp2 := diTemp2 + DINT#11; rTemp1 := DINT_TO_REAL(diTemp2 / DINT#3); // SA0057 rTemp1 := DINT_TO_REAL(diTemp2) / REAL#3.0; liTemp3 := liTemp3 + LINT#13; rTemp1 := LINT_TO_REAL(liTemp3 / LINT#7); // SA0057 rTemp1 := LINT_TO_REAL(liTemp3) / REAL#7.0; --> SA0057: Possible loss of decimal places