Quality of data value as string
Quality indicates the quality of the daitem object's Value property as a string. You can use the Quality property to determine if a value is useful or not.
The Quality string is made up of a major quality string, a substatus string, and an optional limit status string, arranged in the format 'Major: Substatus: Limit status'. The limit status part is omitted if the value is not limited. The major quality can be one of the following values:
The value is not useful for reasons indicated by the Substatus.
The value is of good quality.
The quality of the value is uncertain for reasons indicated by the Substatus.
For a list of substatus and limit status values and their interpretations, consult OPC Quality Strings.
The default value is 'Bad: Out of Service'.