Published: December 9, 2020
groov Analog Totalization Works Incorrectly When Input Goes From Invalid to Valid
GRV-EPIC-PR1: All versions prior to 3.0.0GRV-R7-MM1001-10: All versions prior to 3.0.0
Resolved In Version:
GRV-EPIC-PR1: 3.0.0GRV-R7-MM1001-10: 3.0.0
On a GRV-EPIC-PR1 with any analog input channel that is performing analog totalization, you may see any of the following:
- If the invalid state lasted more than 21.475 seconds, then the analog totalized value will be reduced only on the first calculation after the analog input goes from invalid (QNAN + quality code) to valid. The magnitude of the reduction is proportional to how long the invalid state persisted and inversely proportional to the totalizer rate.
- If the invalid state lasted less than 21.475 seconds, then the analog totalized value will be increased in a step-like manner only on the first calculation after the analog input goes from invalid (QNAN + quality code) to valid.
- Depending on the current totalized value and the totalizer rate, if the invalid analog input persists for a long period of time, then the calculated totalized value could produce an invalid values (QNAN) for an extended period of time.
If the totalized value is QNAN then doing a read and clear of the analog totalized value will clear the condition to allow totalizing to resume; however, the previously totalized data is cleared.
Opto 22 has resolved this issue.
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