KB89246
Published: November 4, 2020
Revision: 2.0

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

Resolved In Version:

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 and will include the fix in an upcoming release.

Questions?

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


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