This read-only Integer32 is a bitmap where each bit flags whether a specific measured channel has crossed its high warning (non-critical) threshold, with bit assignments given directly in the description: bit0-2 for the three current phases (currA/B/C), bit6-8 for the three voltage phases (voltA/B/C), bit12-13 for the two temperature probes, and bit14-15 for the two humidity probes. An admin reads this single value instead of polling every individual sensor to instantly see which class of measurement has entered a high-warning state short of a full critical alarm, then drills into the specific probe or phase. For example, if alarmsWarnHiMap has bit14 set, humidity1 has crept into warning territory, giving the admin a chance to react before it escalates to the alarmsMaxMap critical bit.