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
Example
TYPE u1: UNION lrTemp : LREAL; liTemp : LINT; END_UNION END_TYPE PROGRAM PLC_PRG VAR uVar: u1; END_VAR --> SA0115: Unions not allowed