IFDEF:
Determines one of two possible outcomes based on the existence of a
specified non-alarm tag at compile time. Use one of the macros
below for alarm tags.
IFDEFAdvAlm: Determines one of two possible
outcomes based on the existence of a specified advanced alarm tag
at compile time.
IFDEFAnaAlm: Determines one of two possible
outcomes based on the existence of a specified analog alarm tag at
compile time.
IFDEFDigAlm: Determines one of two possible
outcomes based on the existence of a specified digital alarm tag at
compile time.