SA0115: Variables with data type UNION

Detects declarations of a UNION data type and variable declarations of the UNION type

Justification: The IEC 61131-3 standard does not include unions. The code is more easily portable without unions.

Importance: Low

TYPE A_UNION: 
UNION
    lrTemp : LREAL;
    liTemp : LINT;
END_UNION
END_TYPE

PROGRAM PLC_PRG
VAR
    aunionVar: A_UNION;
    liVar : LINT;
END_VAR

aunionVar.lrTemp := 0.123E-12;
liVar := aunionVar.liTemp;