Hi everyone,
In my Ignition project, I have a Python script in the Project Library that communicates with VideoJet devices via sockets. This script works properly and is responsible for writing values to VideoJet devices
I have linked this script to a Tag Change Script inside Gateway Event Scripts so that whenever a specific tag changes, the script is triggered and writes the corresponding value to the VideoJet device.
Now, I need to set this up for 100 different tags, meaning I would have to create 100 separate Tag Change Scripts in Gateway Events.
My questions:
• Is there a way to dynamically handle this in a single script instead of creating 100 separate Tag Change Scripts?
• If I were to create 100 separate Tag Change Scripts in Gateway Events, would this cause performance issues or system overload?
• What is the best practice for managing this efficiently in Ignition?
Thanks in advance
Gateway event tag change scripts allow multiple tag paths to be triggers. Write the script once there, looking at the tag path if necessary. Add all 100 tags as triggers.
Thanks Kevin,
For example, Each device has a different tag change trigger.If I add 100 different tags as triggers in a single Gateway Event Tag Change Script, will it still work? Did I understand correctly?
Thanks
Yes, but your script needs to inspect the event information to determine which of the many tags it is handling at that point. The rest of the script must be written to use variable tag paths to read or write anything other than the one tag value supplied with the event.
Also be aware that no matter how many tag paths are attached to the one event, they will be executed one at a time on a dedicated thread. You may need to split your processing into multiple events. (They can all still call the same project library function.)
Hi,
I actually wanted to provide more details about the code because I’m still not sure if I’m doing everything correctly. 
Thanks again for your detailed response.
1-) My script takes these parameters, and I communicate with the device through the project library. I have defined the parameters.
def Main(HOST, PORT, tag_path1, tag_path2):
2-) Then, a UDT structure was created. I defined the tag structure for each machine one by one.
3-) After that, in the tag change script, if only the value changes for one of these tags, the values are retrieved and sent to the machine.
In this setup, do I need to execute the code in the project library with a threading approach, or is it sufficient as it is? If I need to run it with threads, will I do this in the project library code? And how should I do this in ignition?
Hi, Batuhan. Please see Wiki - how to post code on this forum. Post screengrabs to show context but unless the code is really trivial it's a good idea to post the formatted code instead or as well so we can copy and edit it rather than have to type it all out from your screengrab.
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