Holds the current set of active error/fault conditions for a connector — this is the tag type behind the %ERROR channel. Unlike DiagnosticTag's rolling log, ErrorTag tracks each distinct error by its message number: a given error condition updates or clears in place rather than piling up a new entry every time it re-fires.
The set of currently active error messages (number, description, details), keyed by message number.
ErrorTag doesn't support Transform — the field is ignored entirely for this type, even if something is entered into it.
ErrorTag doesn't use Type Attributes — the field has no effect if set.