Dataset Expression Tag - Not populating

Ignition
1

I’ve created an expression dataset tag to hold2 columns of data. I would like to populate this tag with the runscript expression.

When i try to use runscript in the dataset tag expression window the tag shows a red X as if there is an error somewhere.

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The script runs and returns the data just fine in a script consol window and when called via expression for the dataset to a repeater.

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I’m not sure why I can’t get this to properly return the dataset in question.

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3

Tags are not in a project, so cannot call any project resources. Only scripts in the shared.* namespace are usable. Also, you really need to get your code out of the legacy app.* namespace – it’s going away eventually, and its scoping rules create numerous headaches.

4

This script is located in the global shared script library, not part of the project. All of my scripts reside here, is that not where they should be?

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5

Can you post your getTankDataset code?

7

Ok, missed that the first time.

Meanwhile, please add triple-backquotes on a line above your code, and again below your code, so the rest of us can read it... ( Use these: ``` )

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# Function used to return a dataset of tanks for a specific pad
# Used to populate the tank template repeater on the pad data page
# Takes an tagpath argument of PadRootFolder
def getTankDataset(PadRootFolder):		
	import system
	path = PadRootFolder+"/Pad"
	 
	 # Create the rows for the dataset
	rows = []
	tags = system.tag.browseTags(parentPath = path, tagPath = '*tank*_name', sort = "ASC")
	row_count = 0
		
	for tag in tags:
		tag1 = system.tag.read(tag.path)
		
		if tag1.quality.isGood():
			tagName = tag.name
			endChar = tagName.rfind("_name")
			tagNum = tagName[4:endChar]
			row_count += 1
			newrow = [PadRootFolder, int(tagNum)]
			rows.append(newrow)
	
	#Create the dataset to send back
	headers = ["PadRootFolder","TankNumber"]
	dataSet = system.dataset.toDataSet(headers,rows)
	return  system.dataset.sort(dataSet, "TankNumber", 1)
1 Like
10

Try including a provider in your PadRootFolder.

11

Thanks Phil, I just attempted that but it still won’t execute the call. If i have to I can make the tags memory tags and write the dataset to them via script. But i feel like I shouldn’t need to do that.

12

Look in your gateway logs for errors related to this tag. There should be something.

13

I mocked up your code on my system and it works fine. Did you save global after creating the shared script?

14

Thanks for all the responses guys. I have been trying to get anything to show up in the gateway log and I’ve been unsuccessful.

Also, I have saved globally after creating that script. I do have other scripts in the same script library which I have been able to call in an expression tag without any problems. I’m still at a loss as to why this won’t work for me on my end.

15

Consider adding logging to your script module to locate exactly where it is failing. Include a log call at the global level at the end of the script module so you can confirm that it is fully loaded without top-level errors.