Initial parametrized values in a power chart

Ignition
1

Hello everyone, i’m working on a project where i have to show the value from a tag with history in a power chart. The tag path is dynamic, and this value is set passing a parameter to this page with an On Click action, changing the “object or machine” where the value from tag is pulled. I have already tried in the way Inductive University does it and it doesn’t worked, so maybe you have another idea.

My question,

  1. How can I change the path where the data is pulled with the parameter, so it takes it from different objects or machines?
  2. Is there any form where i can set values to the power chart so it always shows the tag data in the chart without having to select it in the tag browser?
2

Try binding props.pens.0.data.source to the view parameter containing the tag path.

Power Chart data source

3

I’m trying to bind it with this structure:

{LiveAnalysisEquipmentPath}/OEE Performance

Where {LiveAnalysisEquipmentPath} is the parameter that brings the path and is not working, it shows nothing.

I bound the parameter to the label that is down on the left to be sure the parameter is passing correctly to the page and it’s working.

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4

It’s not clear what exactly you have done.

Try this:

  • Run the Power Chart in Developer preview mode.
  • Add one of the history tags you are interested in monitoring.
  • Stop the preview and examine the historian tag path. See if that matches the one in your label.

I suspect you may be passing in the live tag instead of the historian. For example, I have a simulation tag on my test gateway with actual tag path,
[default]Machine1/Compressor1 motor amps

Its historian tag is
histprov:Historian:/drv:ignition-desktop-l2q5jpp:default:/tag:compressor1 motor amps

You need the second format.

1 Like
5

Where do I get the format from? Is there an easy way to get the format and whats the best way to have it dynamic?

6

Technically, you do not need the second (historical tag path) format anymore. Since v8.1.14 the perspective Power Chart will accept the first format (non-historical tag paths) and convert it internally.

However, if one wanted to change the format, something like this works.

from com.inductiveautomation.ignition.common.tags.paths.parser import TagPathParser
from com.inductiveautomation.ignition.common import QualifiedPathUtils

def getQualifiedPath(path_string):
	myBasicTagPath = TagPathParser.parseSafe(path_string)
	myQualifiedPath = QualifiedPathUtils.fromTagPathNew(myBasicTagPath)
	return myQualifiedPath.toString()
	
path_string = "[System]Gateway/UptimeSeconds"
qualifiedPath_string = getQualifiedPath(path_string)
print path_string 
print qualifiedPath_string

>>> 
[System]Gateway/UptimeSeconds
prov:System:/tag:Gateway/UptimeSeconds
>>>

For further study, this is a good reference: Javadocs & Notable API Changes
Pick an Ignition version then use the search feature to look up the details of the imported classes.

2 Likes
7

Well, except for the gotcha with remote tag providers discussed over here:

1 Like
8

Thanks, so I can use a regular tag path unless i a remote tag provider?

1 Like