Persistence of data in global dictionary?

Ignition
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1

Hi all

I have an Ignition Edge 8.0.14 licensed with the Compute module. Thus I have Gateway Event Scripts.
In the scope of these scripts it appears that all data in the global dictionary (as retrieved by system.util.getGlobals()) are cleared every time I save my project to the gateway (at least when there are changes to the scripts). Is that how it is supposed to work? I was hoping data in that dictionary was persistent at least when the project. I believe that was how the “standard” Ignition was working…

2

Looking into the documentation, it seems like when the scope that the global dictionary is in has been altered, it would then be ‘refreshed’ and emptied.

https://docs.inductiveautomation.com/display/DOC80/system.util.getGlobals

Since you are using Ignition 8, I would suggest using a memory tag with a Document datatype and push your dictionary into there. Not quite as convenient as accessing the global dictionary, but it should survive any scope restarts.

1 Like
3

It used to not be emptied. Which breaks a great deal of the code I use to manage lifetimes for asynchronous threads. Since IA seems to be oblivious about the significance of this, I created a special module (free) just for this purpose, announced here:

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4

OK, thanks a lot, I’ll try that.

5

Hi Phil, your module doesn’t install on Ignition Edge. I get a state " Faulted: Not eligible for use with Ignition Edge, unless licensed"

6

Ah, yes, Edge has a whitelist of eligible modules, and mine aren’t on it. Sorry. Your sales agent at IA can help, though.