KB88273
Published: August 20, 2019
Revision: 2.0

groov analog input values may read low after restarting GRV-EPIC-PR1


Applies To:

Firmware for GRV-EPIC-PR1

Versions Affected:

All versions prior to 1.4.0

Resolved In Version:

1.4.0


Symptoms:

Analog input values may read low after restarting GRV-EPIC-PR1. This is caused by the gain parameter for the analog input inadvertently being set to 0.8999, instead of 1.0. This can happen after restarting GRV-EPIC-PR1 if the following steps have occurred:

  1. You do a Reset I/O to Defaults operation on your GRV-EPIC-PR1.
  2. In PAC Control, you download a strategy with the option set to store the strategy to flash and with the analog input channel configured to not send values for Offset and Gain. (In PAC Control, when you edit or add an analog point, the "Send Values" checkbox for Offset and Gain is not checked.)
These symptoms are similar to those described in KB87693; however, the cause is different.

Workaround:

The correct default values for offset and gain are 0 and 1.

Do one of the following:

  • From within PAC Control, edit all analog input channels so you can check the "Send Values" checkbox for Offset and Gain and use the correct default values (0 and 1, respectively).
  • After a PAC Control strategy is downloaded, go to groov Manage, navigate to the configuration page for all analog input channels (Home > I/O > analog_module > channel > Configure), ensure that offset and gain are configured correctly (0 and 1, respectively), then click "Save".
After either procedure, the values will properly persist in flash.

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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