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Engingeering units are created wrong for cascade control blocks in DeltaV

Question asked by a.olsen on Jun 4, 2018
Latest reply on Jun 5, 2018 by vwolf


We use DeltaV for plant control. Sometime after a DeltaV upgrade to v12, cascade control blocks would create and sync the engineering units of the PV tags as %. Nobody knows why it does this, and are unable to rectify it. The set point EU in the same block are created and synced in the proper EU (°F, PSIG, etc) but the PV we use for most all display and spreadsheets return the percentage of the control. We would like to see the EU.

For example;

In the above list, the SP and PV should read °F as the EU. It is only like this on cascade control loops.

We use the OPCHDA connector and I can't see where there is anything else to map to to fix it.


I was just curious to see if anyone else has ever had this issue.