SeverityHigh contains a value indicating the highest severity of interest for the event.
To receive events of all severities, set this value to 1000. It is also commonly called "priority", especially in relation to process alarms. Values will range from 1 to 1000, with 1 being the lowest and 1000 being the highest. Typically a severity of 1 would indicate an event which is of minor importance, whereas a value of 1000 would indicate an event of immense dimension which could result in severe financial loss or loss of life.