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External Reference | Online Value and Status is "???"

DeltaV 13.3.1

I've got an issue resolving external references but only between a specific controller and application station.

I've got an MD controller running a control module with external references to modules in an application station.  Currently, all of those external references are showing an online value of ??? and an online status of ???.
The issue seems to be isolated to the controller reading from the application station.

Additional info:
Other controllers can read these same values from the application station
The affected application station can READ values from the affected controller.
On the affected controller, if i go into diagnostics and view the communications connection list, the app station shows up normally and in a ready state.

Gonna be digging around but was hoping you guys could help me save some time. Slight smile

Invalid String
  • Matt Forbis

    In reply to Invalid String:

    Every node has it's own copy of the the module table that's downloaded. This is what allows the distributed nature of DeltaV and allows it to work between any nodes, with no requirement for any server like the Pro+. The module table is basically a list of modules and where to find them so that each node knows where to go to resolve paths. It does not include individual parameters down inside of a module.

    Another example of things covered by setup data is named sets. All named sets have to be downloaded to every node that needs them so the nodes can convert numbers to strings.

    So, when in doubt, downloading "Changed Setup Data" is always a good first troubleshooting step. Please note, I mentioned "Changed". In general, downloading "Setup data" should not cause issues, but the number 1 rule of downloading I follow is the minimum amount of downloads the better. By choosing Changed Setup Data, you will only download the pieces that need updating.

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