Using derived tags for nested JSON - structures

Hi, I'm using nested jsonGet() functions to reconstruct data-tags from a read JSON structure.

My input JSON:

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Uncertain value appears after reconstruction, I am using UDT. I recreated this situation without UDT and it works without probem. Why such problems when I do it using the method I indicated.

Below is the version that works without a problem.

You can see that where it does not work the function is grayed out. From what I have determined myself it does not interpret {TagName} correctly.

Here you can see that the nested internal JSON function works but using {TagName} Uncertain appears.

Here a still version when I enter it manually.

These {TagName} bindings are a very useful option allowing to which I can copy one function for several hundred tags without nameing addressing.

Greetings

Problem solved. It's a matter of using expression editor instead of binding editor. So my question is what is the difference between both? And why doesn't it work in bindings - it works in a limited way without being able to use {TagName}?

I believe the 'binding' executes at a somewhat different time, it's a sort of "precalculation" before the rest of the tag starts running. An expression is always a true runtime calculation, so it's not subject to the same limitations.

As an aside, I think you should be able to use a single jsonGet to retrieve the information you want; using two is making things less efficient.

It's JSON inside JSON so I haven't found another way to extract this data from the tag

The second argument to jsonGet is a JSON path; it doesn't have to be a single JSON key. So you could pass e.g. jsonGet(json, "[1]AB_Line_Voltage") and it should work. You just need to dynamically assemble the full string.

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I tested it and it actually works, excellent. Thank you for your advice!

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