Get tag name and save it on a variable

Ignition
1

Inside tag scripting menu. I trying to get automatically the name of the tag and save it to a variable, in order to user later to get the value of the tag. And I would like to get the full path of the tag and use later in the readBlocking function. The code that I using is :

# Run the Named Query|
tag = system.tag.readBlocking([[**Sample_Tags]Random/RandomInteger1**])[0]|
# Create a python dictionary of parameters to pass|
parameters = {DataName:RandomInteger1, DataValue:tag.value}|
system.db.runNamedQuery(samplequickstart,UpdateTagValueQuery,parameters)|

Actually I putting the path name ("Sample_Tags]Random/RandomInteger1") manually.
And I would like to get it in auto.

2

Welcome to the forum, Daniel.
Please have a read of Wiki - how to post code on this forum and then hit the pencil icon below your post to edit and fix the code formatting. Thanks.

3

What event are you using to run this code? Because origin information is part of tag events, but format varies with type of event.

4

Hi. I m using tag value change event. Appreciate your support.

5

You didn't quite manage to format the code. (What are all the | characters?)

tag = system.tag.readBlocking([[Sample_Tags]Random/RandomInteger1])[0]
The tag name needs to be quoted like this:
tag = system.tag.readBlocking(["[Sample_Tags]Random/RandomInteger1"])[0]

parameters = {DataName: RandomInteger1, DataValue: tag.value}
That looks OK. (Add spaces after punctuation, same as English.)

system.db.runNamedQuery(samplequickstart, UpdateTagValueQuery, parameters)
That looks OK too

Back to your question:

I trying to get automatically the name of the tag and save it to a variable ...

  1. What is the source of the tag name?
  2. Why are you doing it this way? What is the real problem you are trying to solve?
6

Your '”' and '[' are swapped at the beginning of the provider.

system.tag.readBlocking(["[Sample_Tags]Random/RandomInteger1"])[0]
7

It was actually missing a [.
Fixed, thanks!

8

This is wrong too unless there are DataName, RandomInteger1, and DataValue variables defined further up in the script. These need to be in quotes otherwise.

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9

Apprecite your support.
Here the response to your questions.
1.- Actually the source ot the tag is a memory tag, saved in a specific folder.
2.- The main problem is that I need to determinate the tag name automatically. I know, if I use the change value trigger, I need to put the tag name to get the value. But, I need that inside the script, use a function o something to get the tag name ("RandomInteger1"), not put it manually as string. Regards

10

No, you're describing your solution again. That's not the original problem. I suspect that you've gone down the wrong path.

11

The value change event's event.tagPath contains the full path/name of the subject tag. So, no, you do not need the tag's own name in your script.

Also, tag event scripts run in a context where system.tag.readBlocking() and system.tag.writeBlocking() understand tag names of the form [.]someName as references to sibling tags in the same folder as the subject tag.

So the answers to both of your original questions are right there in the event object.

1 Like