Using third party libraries with ignition tags as variables

[Pyrak]

I have process that requires me to use steamtables (thermodynamics) to calculate heat consumption in my system using tag values from my plc. I need the calculations done in realtime. If I install pyXSteam to the C:\Program Files\Inductive Automation\Ignition\user-lib\pylib> I get this error:

Could not import runpy module
Traceback (most recent call last):
  File "<frozen runpy>", line 14, in <module>
  File "<frozen importlib.machinery>", line 3, in <module>
ModuleNotFoundError: No module named 'importlib._bootstrap'

Is there a way I run the script externally or within Ignition using the library while using tag values as input variables to the script?

[Benjamin_Furlani]

You may not have all the dependencies that pyXSteam requires. Or that library is expecting python3 when Ignition is using Jython2.7

specifically

[pturmel]

You should consider using @bmusson's free 3rd party module for this task. Part of his Embr project:

GitHub - mussonindustrial/embr: Modules for Ignition by Inductive Automation 🔥

Look at the "Releases" in the right sidebar.

[bmusson]

Yup, this should have everything you need. Here’s the direct link to the docs:

mussonindustrial/embr/blob/47afbabb963380856435f777468d981b8f1dada4/modules/thermo/README.md

[Pyrak]

Thanks a lot @pturmel and @bmusson

[Pyrak]

@bmusson there seems to be a configuration issue when I use the expression examples in the readme file.

[pascal.fragnoud]

Check the tag's diagnostics. Click this icon on the top right of the tag popup window:

This will give you more details:

[Pyrak]

The function seems fine from the expression side. What could I be doing wrong?

[pascal.fragnoud]

Did you install @bmusson's module ?
The functions listed in the readme are part of his module, they are NOT built-in.

The diagnostic message "Unknown function: 'if97'" suggests that you did not install the module, or that it wasn't installed properly.

[Pyrak]

Yeah, I have the module installed.
If I add an expression binding to a label component using the same function everything works fine. I am only experiencing the problem when I use it in an expression type tag.

[pascal.fragnoud]

I'm not sure that's relevant for expressions, but that sounds like global scripting project issues.

Do you have a GSP configured ? You can find this on your gateway page, under config -> gateway settings.

[Pyrak]

It's not configured

[pascal.fragnoud]

Try configuring it (just put the name of your project) and see if it changes anything.

[Pyrak]

Nothing has changed.

[bmusson]

Can you restart your gateway?

Custom Expression Function not recognized "Unknown Function"

Interesting. I had a report here in the forum about my Integration Toolkit functions not working for expression tags but everywhere else. That reporter fixed it by restarting their gateway and I never reproduced it. Bug in the tag provider hierarchy, perhaps?

[victordcq]

restart gateway after filling that in

[Pyrak]

Everything works fine after restarting the gateway.
Thank you.