I am trying to do an external reference from one module to another and have never had this issue before, but here is the scenario...
I read the PV of a PID block either directly from the PID block or via a paramater wired from the PID block. When I read the parameter from another module it is showing a value of 0 with red ??? beside it. It is ran through a scaler block and the status of the input shows 'Bad NoCommNUV'.
Ive never seen this before and am doing this exact same thing in several other places with no issues at all.
Any suggestions?
Is it possible your external reference source exists on a different controller than your destination and your two controllers do not have peer-to-peer connectivity?
Make sure your external reference parameter is a read (not a write) if you are referencing a PID/PV.
Can you provide screen shot of the issue?
In reply to jwooten84:
Try downloading changed setup data on each controller and the proplus. The controller's keep a lookup table of modules that they host, so perhaps if the module is new, the setup data has not been properly spread across peers.