KB90183
Published: March 30, 2022
Revision: 1.0

Scaling values for analog channels may not be correct


Applies To:

Firmware for the following groov EPICs:

  • GRV-EPIC-PR1
  • GRV-EPIC-PR2
Firmware for the following groov RIOs:
  • GRV-R7-MM1001-10
  • GRV-R7-MM1001-10
  • GRV-R7-I1VAPM-3

Versions Affected:

For groov EPICs: All versions
For groov RIOs: All versions prior to 3.3.1

Resolved In Version:

For groov RIOs: 3.3.1


Symptoms:

If you set the scaling values for an analog channel such that the new high scale value matches the current low scale value or the new low scale value matches the current high scale value, then one of the scaling values will be set to the default value, as follows:

  • If you set the scaling values through a PAC Control strategy or CODESYS application, then the high scale value is set to the default.
  • If you set the scaling values through groov Manage, then low scale value is set to the default.

Workaround:

  • After PAC Control or CODESYS configures the I/O, use groov Manage to manually set the desired values for the high or low scale.
  • If you want to adjust the I/O channel's current default scaling,
    • To set a high scale value that matches the current low scale value, set the scaled value to just below or above the desired value.
    • To set a low scale value that matches the current high scale value, set the scale value to just over or below the desired value.

    For example, a 4–20 mA channel has a default scaling of 20.0 mA for high and 4.0 mA for low. If you want to set the high scale value to 4.0 and the low scale value to 0.0, then use 3.99999 or 4.00001 for the high scale.

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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