The limit status is not dependent on the major quality and substatus parts of a quality value.
The following table lists the limit status values and strings used in OPC Toolbox™ software.
Limit Status String
The value is free to move. Note that when the limit status has this value, it is omitted from any quality string in the toolbox.
The value is fixed at some lower limit.
The value is fixed at some upper limit.
The value is a constant and cannot change.