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OPC-10000-9 – OPC Unified Architecture - Part 9: Alarms & Conditions5.8.22.1 Overviewshall be negative, indicating a number below the target value and the HighLimit and HighHighLimit shall be positive, indicating a number above the target value. If provided, the limits shall ... zero and shall follow these rules: HighHighLimit > HighLimit LowLimit > LowLowLimit . For example, if the LowLimit is -2 then a LowLowLimit of -1 would not be allowed