Major Quality

Industrial Communication Toolbox™ uses the following major quality values and text. The major quality is contained in bits 7 and 8 of the quality value.

Major Quality Values

Value	Quality Text	Description
0	Bad	The value is not useful for the reason indicated by the substatus. The table Bad Quality Substatus Values 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 Values contains information about the substatus for uncertain quality.
3	Good	The quality of the value is good. The table Good Quality Substatus Values 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.

Related Topics

• OPC Quality
• Quality Substatus
• Limit Status