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Quality
flags are critical for determining the state, age, and availability of data.
Some quality flag parameters include:
· Valid
· Invalid
· Older than
normal
· Questionable
· Overflow of an
analog value
· Out of range
· Bad reference
· Oscillating too
rapidly
· Failure
· Inconsistent
· Inaccurate
· Substituted for
another value
· Provided by a
source that does not provide quality flags
· Calculated value
· Manually entered
value
· Under test or in
maintenance
· Blocked so that
the value is not updated
· Tagged to
prevent different types of control actions
Keywords:
Quality, flag, tag, block, validation
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