When the given sensor's reading exceeds this threshold, a notification is generated. If no notifications are desired for this sensor, set this threshold to 0. (No corresponding _NotifyIfBelow has been provided, as such a function is not anticipated to be useful. We don't forsee low temps or infrequently/slowly operating fans to be interesting events to send notifications on). (Note that the corresponding notification is NOT defined here since such notifications are defined in the ccFault group). The WS5100 switch does NOT support any thresholds on fans. (It is retained here in expectation that other platforms will allow such thresholds). If this value is SET on a WS5000, (for a row that represents a fan), a SET-FAILED, (bad value) will be returned.