Documentation

Major Quality

OPC Toolbox™ software uses the following major quality values and strings. The major quality is contained in bits 7 and 8 of the quality value.

Major Quality Strings Used in OPC Toolbox Software

Value

Quality String

Description

0

Bad

The value is not useful for the reason indicated by the substatus. The table Bad Quality Substatus Strings contains information about the substatus for bad quality.

1

Uncertain

The quality of the value is uncertain for reasons indicated by the substatus. The table Uncertain Quality Substatus Strings contains information about the substatus for uncertain quality.

3

Good

The quality of the value is good. The table Good Quality Substatus Strings contains information about the substatus for good quality.

N/A

Repeat

The value is repeated from a previous known value for this item. This toolbox-specific value occurs only in data returned from getdata or opcread, when you request array formatted values.

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