Criteria for a Valid Value
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Good Status - A Process Variable (PV) must have a status indicating it is "good." This means the value is current, reliable, and not flagged as erroneous or invalid by the system.
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Bad Status - An input with invalid conditions such as sensor issues, out-of-range values or communication disruptions is considered to have “bad status” and is excluded from calculations.
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Active and Connected - A channel must actively provide a process value. A disconnected or inactive channel is not considered valid.
Related topics - Understanding Runtime Status Indicators.