groov Analog Totalization Works Incorrectly When Input Goes From Invalid to Valid

Applies To:

Firmware for:

GRV-EPIC-PR1
GRV-R7-MM1001-10

Versions Affected:

GRV-EPIC-PR1: All versions prior to 3.0.0
GRV-R7-MM1001-10: All versions prior to 3.0.0

Resolved In Version:

GRV-EPIC-PR1: 3.0.0
GRV-R7-MM1001-10: 3.0.0

Symptoms:

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.

Workaround:

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.

Resolution:

Opto 22 has resolved this issue.

Questions?

Contact: Opto 22 Product Support.
Phone: 800-835-6786 or 951-695-3080
Email: support@opto22.com

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