Could not load parameter model

Ignition
1

Hey guys!

I’ve created a Nested UDT with parameters and while attempting to run the wizard, I ran into an error without detail that says “Could not load parameter model”.

Any I dea why that may be happening?

I’m attaching the error as an image.

More info:
My child UDTs each have a parameter (called Offset) to be used as a pointer on where to start reading the data (since I’m reading Siemens’ DB).
Each tag uses this offset for the indirect addressing, so I get DB500.Real{Offset+n} (n being a fixed number on each tag since the structure is fixed).

Now, on My parent UDT, I have a “MainOffset” parameter, and on the children instances I have declared the Offset parameter as {MainOffset+n} (n being each UDT’s corresponding offset, fixed number}.

image
image629×566 30 KB

2

Anyone else seeing this? I have the same issue (not nested UDT’s) - the multi instance wizard has always thrown this error in Ignition 8 for me.

3

Hello Julian.

We’ve been investigating what the problem could be. The fact is that you must define a default tag provider and database in the project properties.

Once you’ve done this, the problem goes away.

Hope this might be helpfull for you.

1 Like
4

Sorry, a what again?

  • So, what you mean is that Ignition’s OPC Server isn’t the default provider?
  • And is a database is needed even if I’m not used archived tags?
5

Yes, database is necessary ever.
image

Tried to create the UDT in this folder

6

image
image695×518 54.9 KB

and put the default provider in project properties

7

Ignition's OPC Server is not a tag provider at all. It is a provider of OPC items and subscriptions thereto. Tags within Ignition include more than just OPC items.

FWIW, there's a great deal of sloppy terminology around OPC. OPC supplies items that may be tags in a target PLC or other device. They are not connected to tags in Ignition unless subscribed by a tag provider.