How to get active alarm count of all tags in a folder?

Ignition
,
1

I would like to get a count of all active alarms (both ack and non-ack) in tags in a particular folder called "FAB". I have one alarm that is set to true and it is flashing on the standard alarm table in my HMI so I know the alarming is working.
But the tag path filter seems to be broken or I am using it wrong as it always returns zero alarms unless I make the tagpath filter = "*".

This code returns 0

pathValue = "[default]FAB/*"
alms = system.alarm.queryStatus(path = pathValue, state = [2,3])
print len(alms)

this code returns 1

pathValue = "*"
alms = system.alarm.queryStatus(path = pathValue, state = [2,3])
print len(alms)

I have tried many version of the pathValue string and nothing seems to work.
What am I doing wrong ?

Note: the path to the tag that has the alarm associated with it is:
[default]FAB/Pos_1110_Drive/OLFault

My next step is to put this value in a tag that continuously updates. What is best practice for this ?

2

Try the path without the tag provider,
https://docs.inductiveautomation.com/display/DOC81/system.alarm.queryStatus

There are a few exchange resources you could peak at, one here,

3

If you do need the provider included, you can use a path (or source) like this 'prov:default:/tag:FAV/*'

2 Likes
4

Or use the provider parameter.

List[String] provider - A list of tag providers to include in the query. Omitting this parameter will query all providers. [optional]

5

Note, you should never call system.alarm.queryStatus from within a Vision client unless you want performance issues as this is a slow function and all scripts in Vision run in the gui thread so will lock up the interface. You didn't tag your post so not sure what you're using

6

Thanks for tip. I am hoping to create a global expression tag that contains the alarm count for various machines and areas in a factory. The vision clients only read the tags.

2 Likes
7

It is safe to call from an asynchronous function, triggered from a client timer event, and writing results to a client tag. Everything else in the Vision client should reference the client tag.

1 Like
8

This worked. Thanks

Gets the count of all active acked and unacked alarms in the folder "FAB" from the default provider.


pathValue = "prov:default:/tag:FAB/*"
alms = system.alarm.queryStatus(source = pathValue , state = [2,3])
count = len(alms)
1 Like
9

If you're going to do that though, wouldn't you just write to a standard tag so you're not doing this for every client?

10

Yes, unless there is a per-client difference in how the query is called.