Best way to change 465 tag values at once

Ignition
1

I need to be able to swap 465 tag values between 1 and 3. whats the best way to go about doing something like that? each tag is in a different folder but has the same tag name. My thought was just to put it on a button but before I do anything I wanted to make sure there wasnt a better way, and also make sure that I would cause any issues by writing to so many tags at once.

2

Right now it is easiest to perform these writes using the system.tag.writeToTag function in scripting. In Ignition 7.3 (coming out soon) we have a new function called system.tag.writeToTags which allows you to write to multiple tags in one call. That is important because right now each system.tag.writeToTag function can take up to 70 ms a piece if you are not using the tag in the client. In your case it could take 30 seconds or so to perform the writes.

You could use a transaction group to perform the writes but you will have a lot of items and expression items so it is not the best route.

Try it on a button and see what the results are. If they are really slow there are a few techniques to speed it up. You can also make the script shorter by doing the following:folders = ["Folder1", "Folder2", "Folder3", ...] valueToWrite = 1 for folder in folders: system.tag.writeToTag("%s/Value" % folder, valueToWrite)That way you don’t have 465 system.tag.writeToTag lines. Let us know how this goes.

3

thanks I was going to do something similar.

are you gonna also do a system.getTag"s"Value in 7.3, to go along with the system.tag.writeToTags?

IMHO, that is going to make ignition very, very powerful.

4

Yes, there is a
[tt]system.tag.getTagValues([path1, path2, …])[/tt]
and a
[tt]system.tag.writeToTags([path1, path2, …], [value1, value2, …])[/tt]

and actually these are in 7.2.9.