Unable to read/write to tags 2 directories up using '[.]/../../tag'

Ignition
1

Hello,

I have a script that was failing to read a tag that was in a folder 2 levels up from the triggering tag (change event). I confirmed in documentation that I should be able to do this by using '..' twice:

Additionally, you can use ".. " (two periods) to go back one folder from the current relative position, for example [.]../../tag allows you to reference a Tag that is two folders up.

I made a few test tags: There are 3 layers of folders. The bottom layer has a tag with a change event that attempts to write to a tag in one of the parent folders. When pointed up one level with the path '[.]../writeMe', it writes with no issue. When pointed up to the top level with '[.]../../writeMe', it fails to write.

Is there something that might be causing this to fail that I am missing? Is there a different syntax that can be used here, aside from using the full tag paths?

Thanks,
Andrew

image

2

I haven't built this folder structure out and tested this, but I'm pretty sure that you're second example is one level further than the path you were using.

[.]../writeMe is at the same level as the Layer 3 folder. [.]../../writeMe would be to a tag which was in the Layer 1 folder, however, looking at your screen shot, the second writeMe tag is actually in the Layers folder. I believe the correct path would be [.]../../../writeMe.

3

Irose,

Good catch! thank you!

Unfortunately, I'm still unable to reach this tag after correcting the location. Please see below corrected structure and the script attempting the write:

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image764×497 26.7 KB

Thanks again,
Andrew

4

I'm not sure. I set up this structure on a dev gateway and it worked as expected.

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image805×279 23 KB

image

I will note, however, that the best way to write this script would be to combine the writes into one.

def valueChanged(tag, tagPath, previousValue, currentValue, initialChange, missedEvents):
	system.tag.writeBlocking(['[.]../writeMe','[.]../../writeMe'],['Layer 2','Layer 1'])

This server was using V8.1.20, so may not be a one to one with what you have.

If you open the diagnostics view on the Tag Editor, is there any error reported?

Might be worth having support poke around.

5

Thanks again for your help Irose.

When I loaded the project this morning, this was working exactly as expected. I'm not sure why it was giving me so much trouble previously...