On propertyChange event ComponentRunning, bound tags are not loading data

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1

I have a template that I have created and on window startup I would like the data to populate.

This is my Script in the propertyChange Event under scripting on the template.

CanFeedUDT is a UDT type that is bound in the main window with the different equipment that I want to track. WasherEndWord is a plc tag that is in the UDT structure.

if (event.propertyName == 'componentRunning'):
print event.source.CanFeedUDT.WasherEndWord

This prints out None for the value of event.source.CanFeedUDT.WasherEndWord, is there a way that I can wait until CanFeedUDT values are loaded before trying to read the data?

2

Instead of looking at the propertyChange for componentRunning, which occurs before asynchronous bindings respond (tags and queries), look at the change for the property of interest.

3

I can try that, my problem was I could not figure out how to watch for a property change on one tag in the UDT data structure.

4

Ah, that's your problem. Don't use UDT properties.

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5

You could delay the event with invokeLater

6

Yet another reason not to use them to add to the list... :sweat_smile:

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